{"id":120571,"date":"2021-09-16T06:00:13","date_gmt":"2021-09-16T13:00:13","guid":{"rendered":"https:\/\/unit42.paloaltonetworks.com\/?p=120571"},"modified":"2021-09-16T00:13:57","modified_gmt":"2021-09-16T07:13:57","slug":"dangling-domains","status":"publish","type":"post","link":"https:\/\/unit42.paloaltonetworks.com\/ja\/dangling-domains\/","title":{"rendered":"\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u306b\u3088\u308b\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u8105\u5a01\u3068\u305d\u306e\u691c\u51fa\u304a\u3088\u3073\u8513\u5ef6\u72b6\u6cc1"},"content":{"rendered":"<h2>\u6982\u8981<\/h2>\n<p>DNS\uff08Domain Name System\uff09\u306f\u3001\u30cb\u30fc\u30e2\u30cb\u30c3\u30af\u306a\u30c9\u30e1\u30a4\u30f3\u540d\u3092IP\u30a2\u30c9\u30ec\u30b9\u3084\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u306a\u3069\u306e\u69d8\u3005\u306a\u30ea\u30bd\u30fc\u30b9\u306b\u30de\u30c3\u30d4\u30f3\u30b0\u3059\u308b\u540d\u524d\u89e3\u6c7a\u30b5\u30fc\u30d3\u30b9\u3092\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u3002\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u306e\u6700\u3082\u57fa\u672c\u7684\u306a\u69cb\u6210\u8981\u7d20\u306e1\u3064\u3067\u3042\u308bDNS\u3068\u30c9\u30e1\u30a4\u30f3\u540d\u306f\u3001\u901a\u5e38\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u76ee\u7684\u306e\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u30ea\u30bd\u30fc\u30b9\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u305f\u3081\u306e\u4fe1\u983c\u3067\u304d\u308b\u30a2\u30f3\u30ab\u30fc\u306e\u5f79\u5272\u3092\u679c\u305f\u3057\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u8105\u5a01\u30a2\u30af\u30bf\u30fc\u306f\u3001\u5e38\u306bDNS\u3092\u60aa\u7528\u3057\u3066\u4e0d\u6b63\u306a\u30aa\u30f3\u30e9\u30a4\u30f3\u6d3b\u52d5\u3092\u884c\u304a\u3046\u3068\u3057\u3066\u3044\u307e\u3059\u3002\u3068\u304f\u306b\u8a55\u5224\u306e\u826f\u3044\u30c9\u30e1\u30a4\u30f3\u3092\u30cf\u30a4\u30b8\u30e3\u30c3\u30af\u3057\u3088\u3046\u3068\u3059\u308b\u653b\u6483\u8005\u306f\u591a\u6570\u5b58\u5728\u3057\u307e\u3059\u3002\u30c9\u30e1\u30a4\u30f3\u30cf\u30a4\u30b8\u30e3\u30c3\u30af\u3092\u5b9f\u73fe\u3059\u308b\u3055\u3044\u306f\u3001<a href=\"https:\/\/unit42.paloaltonetworks.jp\/dns-vulnerabilities\/\">\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0<\/a>\u3001\u60aa\u610f\u306e\u3042\u308b\u30ea\u30be\u30eb\u30d0\u3001\u30c9\u30e1\u30a4\u30f3\u30ec\u30b8\u30b9\u30c8\u30e9\u306e\u30a2\u30ab\u30a6\u30f3\u30c8\u30cf\u30a4\u30b8\u30e3\u30c3\u30af\u306a\u3069\u3001\u3044\u304f\u3064\u304b\u306e\u3088\u304f\u77e5\u3089\u308c\u305f\u6280\u8853\u304c\u4f7f\u308f\u308c\u3066\u3044\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u3053\u3053\u6570\u5341\u5e74\u3067DNS\u306e\u30a8\u30b3\u30b7\u30b9\u30c6\u30e0\u3092\u5f37\u5316\u3059\u308b\u305f\u3081\u306b<a href=\"https:\/\/www.icann.org\/resources\/pages\/dnssec-what-is-it-why-important-2019-03-05-en\">DNSSEC\u306e<\/a>\u3088\u3046\u306a\u5927\u304d\u306a\u52aa\u529b\u304c\u306a\u3055\u308c\u3066\u304a\u308a\u3001\u3053\u308c\u3089\u306e\u30cf\u30a4\u30b8\u30e3\u30c3\u30af\u6280\u8853\u306f\u5b9f\u73fe\u304c\u96e3\u3057\u304f\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u304b\u308f\u308a\u306b<a href=\"https:\/\/dl.acm.org\/doi\/10.1145\/2976749.2978387\">\u6700\u8fd1\u306e\u7814\u7a76<\/a>\u304b\u3089\u306f\u3001DNS\u3067\u898b\u904e\u3054\u3055\u308c\u3066\u304d\u305f\u8105\u5a01\u3067\u3042\u308b\u300c\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0DNS\u30ec\u30b3\u30fc\u30c9\u300d\u304c\u30c9\u30e1\u30a4\u30f3\u30cf\u30a4\u30b8\u30e3\u30c3\u30af\u306b\u7c21\u5358\u306b\u60aa\u7528\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3053\u3068\u304c\u660e\u3089\u304b\u306b\u306a\u308a\u307e\u3057\u305f\u3002\u672c\u7a3f\u3067\u306f\u3001\u3044\u304f\u3064\u304b\u306e\u30bf\u30a4\u30d7\u306e\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0DNS\u30ec\u30b3\u30fc\u30c9\u3068\u3001\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30ec\u30b3\u30fc\u30c9\u3092\u60aa\u7528\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3067\u304d\u308b\u8907\u6570\u306e\u30c6\u30af\u30cb\u30c3\u30af\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002\u79c1\u305f\u3061\u306f\u3001\u53ce\u96c6\u3057\u305fDNS\u30c7\u30fc\u30bf\u304b\u3089\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30ec\u30b3\u30fc\u30c9\u3092\u7a4d\u6975\u7684\u306b\u7279\u5b9a\u3067\u304d\u308b\u691c\u51fa\u5668\u3092\u4f5c\u308a\u307e\u3057\u305f\u3002<\/p>\n<p>\u79c1\u305f\u3061\u306e\u7d50\u679c\u304b\u3089\u306f\u3001\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u304c\u5b9f\u969b\u306b\u5b58\u5728\u3059\u308b\u8105\u5a01\u3067\u3042\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002\u5177\u4f53\u7684\u306b\u306f\u3001\u79c1\u305f\u3061\u306e\u30d1\u30c3\u30b7\u30d6DNS\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u306b\u304a\u3044\u3066\u3001\u5408\u8a0831\u4e077000\u4ef6\u306e\u5b89\u5168\u3067\u306a\u3044\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u304c\u691c\u51fa\u3055\u308c\u307e\u3057\u305f\u3002\u3055\u3089\u306b\u5fc3\u914d\u306a\u306e\u306f\u3001\u3088\u304f\u7ba1\u7406\u3055\u308c\u3066\u3044\u308b<a href=\"https:\/\/en.wikipedia.org\/wiki\/DNS_zone\">DNS\u30be\u30fc\u30f3<\/a>\u3067\u3042\u3063\u3066\u3082\u3001\u7121\u8996\u3067\u304d\u306a\u3044\u6570\u306e\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u304c\u5b58\u5728\u3057\u3066\u3044\u308b\u3053\u3068\u3067\u3059\u3002\u3068\u304f\u306b\u3001\u30c8\u30c3\u30d7\u30ec\u30d9\u30eb\u30c9\u30e1\u30a4\u30f3\uff08TLD\uff09\u306egov\u3067\u306f13\u500b\u3001TLD\u306e edu\u306f197\u500b\u306e\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u304c\u691c\u51fa\u3055\u308c\u3001<a href=\"https:\/\/tranco-list.eu\/\">Tranco<\/a>\u30c8\u30c3\u30d72,000\u3067\u30824,767\u500b\u306e\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u304c\u691c\u51fa\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u77e5\u540d\u5ea6\u306e\u9ad8\u3044\u30c9\u30e1\u30a4\u30f3\u306f\u3059\u3079\u3066\u30d5\u30a3\u30c3\u30b7\u30f3\u30b0\u3084\u8a50\u6b3a\u306a\u3069\u306e\u653b\u6483\u306b\u60aa\u7528\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u30e6\u30fc\u30b6\u30fc\u3092\u4fdd\u8b77\u3059\u308b\u305f\u3081\u3001\u691c\u51fa\u5668\u304c\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u3092\u7279\u5b9a\u3059\u308b\u3068\u3001\u305d\u306e\u60c5\u5831\u306f<a href=\"https:\/\/www.paloaltonetworks.jp\/products\/threat-detection-and-prevention\/dns-security\">DNS\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3<\/a>\u3084<a href=\"https:\/\/docs.paloaltonetworks.com\/pan-os\/10-1\/pan-os-new-features\/url-filtering-features\/advanced-url-filtering.html\">Advanced URL Filtering<\/a>\u306a\u3069\u3001<a href=\"https:\/\/www.paloaltonetworks.jp\/network-security\/security-subscriptions\">\u30d1\u30ed\u30a2\u30eb\u30c8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30b9\u306e\u8907\u6570\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30b5\u30d6\u30b9\u30af\u30ea\u30d7\u30b7\u30e7\u30f3<\/a>\u306b\u914d\u4fe1\u3055\u308c\u307e\u3059\u3002\u79c1\u305f\u3061\u306f\u307e\u305f\u3001\u5f71\u97ff\u3092\u53d7\u3051\u305f\u30c9\u30e1\u30a4\u30f3\u306b\u5bfe\u5fdc\u3059\u308b\u30c9\u30e1\u30a4\u30f3\u30ec\u30b8\u30b9\u30c8\u30e9\u3068<a href=\"https:\/\/datatracker.ietf.org\/doc\/html\/rfc3912\">whois\u30c7\u30fc\u30bf<\/a>\u304c\u5165\u624b\u53ef\u80fd\u306a\u5834\u5408\u306f\u5f71\u97ff\u3092\u53d7\u3051\u305f\u30c9\u30e1\u30a4\u30f3\u306e\u6240\u6709\u8005\u306b\u3082\u7a4d\u6975\u7684\u306b\u901a\u77e5\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2>\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3: \u898b\u904e\u3054\u3055\u308c\u305f\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u8105\u5a01<\/h2>\n<p>DNS\u30ec\u30b3\u30fc\u30c9\u3068\u3044\u3046\u306e\u306f\u672c\u8cea\u7684\u306b\u306f\u30dd\u30a4\u30f3\u30bf\u3067\u3001<a href=\"https:\/\/tools.ietf.org\/id\/draft-dulaunoy-dnsop-passive-dns-cof-03.html#rfc.section.3.3.1\">rrname<\/a>\u304c<a href=\"https:\/\/tools.ietf.org\/id\/draft-dulaunoy-dnsop-passive-dns-cof-03.html#rfc.section.3.3.3\">rdata<\/a>\u3067\u8868\u3055\u308c\u308b\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30ea\u30bd\u30fc\u30b9\u3092\u6307\u3057\u3066\u3044\u307e\u3059\u3002rdata\u306e\u30ea\u30bd\u30fc\u30b9\u304c\u653e\u68c4\u3055\u308c\u3066\u89e3\u653e\u3055\u308c\u308b\u3068\u3001\u305d\u306eDNS\u30ec\u30b3\u30fc\u30c9\u306f\u300c\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\uff08dangling: \u3076\u3089\u3076\u3089\u3057\u3066\u3044\u308b\uff09\u300d\u72b6\u614b\u306b\u306a\u308a\u3001rrname\u306f\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u3068\u547c\u3070\u308c\u307e\u3059\u3002\u653e\u68c4\u3055\u308c\u305f\u30ea\u30bd\u30fc\u30b9\u304c rrname \u306e\u6240\u6709\u8005\u4ee5\u5916\u306b\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308c\u3070\u3001\u3053\u306e\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0 DNS \u30ec\u30b3\u30fc\u30c9\u306f\u30cf\u30a4\u30b8\u30e3\u30c3\u30af\u53ef\u80fd\u3067\u3042\u308b\u3068\u8003\u3048\u3089\u308c\u307e\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3068\u3057\u3066\u3001DNS\u30ec\u30b3\u30fc\u30c9\u304c\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u72b6\u614b\u306b\u306a\u3063\u305f\u3089\u3001\u5bfe\u5fdc\u3059\u308bDNS\u30be\u30fc\u30f3\u304b\u3089DNS\u30ec\u30b3\u30fc\u30c9\u3092\u524a\u9664\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u6b8b\u5ff5\u306a\u304c\u3089\u3001\u5b9f\u969b\u306b\u306f\u30c9\u30e1\u30a4\u30f3\u306e\u6240\u6709\u8005\u306f\u30af\u30ea\u30fc\u30cb\u30f3\u30b0\u3092\u5fd8\u308c\u3066\u3057\u307e\u3046\u3053\u3068\u304c\u591a\u304f\u3001\u7d50\u679c\u3068\u3057\u3066\u591a\u304f\u306eDNS\u30ec\u30b3\u30fc\u30c9\u304c\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u3057\u305f\u72b6\u614b\u306b\u306a\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n<p>DNS\u306e\u4ed5\u69d8\u3067\u306f\u6570\u5341\u7a2e\u985e\u306eDNS\u30ec\u30b3\u30fc\u30c9\u30bf\u30a4\u30d7\u304c\u3042\u308a\u3001\u305d\u306e\u3046\u3061\u306e\u3044\u304f\u3064\u304b\u304c\u30cf\u30a4\u30b8\u30e3\u30c3\u30af\u53ef\u80fd\u306a\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30ec\u30b3\u30fc\u30c9\u306b\u3064\u306a\u304c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u672c\u7a3f\u3067\u306f\u3001\u88681\u306e\u3088\u3046\u306a3\u7a2e\u985e\u306e\u30ec\u30b3\u30fc\u30c9\u306b\u6ce8\u76ee\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<table style=\"width: 100.28%;\">\n<tbody>\n<tr>\n<td style=\"width: 9.81308%;\"><b>\u30bf\u30a4\u30d7<\/b><\/td>\n<td style=\"width: 206.542%;\"><b>\u8aac\u660e<\/b><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 9.81308%;\"><span style=\"font-weight: 400;\">CNAME<\/span><\/td>\n<td style=\"width: 206.542%;\"><span style=\"font-weight: 400;\">rrname\u304c\u30ab\u30ce\u30cb\u30ab\u30eb\u540drdata\u306e\u30a8\u30a4\u30ea\u30a2\u30b9\u3067\u3042\u308b\u3053\u3068\u3092\u793a\u3059\u3002<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 9.81308%;\"><span style=\"font-weight: 400;\">MX<\/span><\/td>\n<td style=\"width: 206.542%;\"><span style=\"font-weight: 400;\">\u5bfe\u8c61\u30c9\u30e1\u30a4\u30f3\u5b9b\u306e\u30e1\u30fc\u30eb\u3092\u53d7\u4fe1\u3059\u308b\u8cac\u4efb\u306e\u3042\u308b\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u3092\u6307\u5b9a\u3059\u308b\u3002<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 9.81308%;\"><span style=\"font-weight: 400;\">NS<\/span><\/td>\n<td style=\"width: 206.542%;\"><span style=\"font-weight: 400;\">\u6a29\u5a01\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc\u306b\u59d4\u4efb\u3059\u308b\u3002<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p style=\"text-align: center;\"><span style=\"font-size: 12pt;\"><sup><span style=\"color: #999999;\"><em>\u88681 \u672c\u7a3f\u3067\u691c\u8a0e\u3057\u305f\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0DNS\u30ec\u30b3\u30fc\u30c9\u306e\u7a2e\u985e<\/em><\/span><\/sup><\/span><\/p>\n<p>CNAME\u30ec\u30b3\u30fc\u30c9\u306f\u3001\u30a8\u30a4\u30ea\u30a2\u30b9\u30c9\u30e1\u30a4\u30f3\uff08rrname\uff09\u306e\u30ab\u30ce\u30cb\u30ab\u30eb\u540d\uff08rdata\uff09\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002\u30a8\u30a4\u30ea\u30a2\u30b9\u306b\u5bfe\u3059\u308bDNS\u30af\u30a8\u30ea\u306f\u3001\u305d\u306e\u30ab\u30ce\u30cb\u30ab\u30eb\u540d\u306b\u89e3\u6c7a\u3055\u308c\u3001\u305d\u308c\u306f\u3055\u3089\u306bA\/AAAA\u30ec\u30b3\u30fc\u30c9\u306b\u89e3\u6c7a\u3055\u308c\u307e\u3059\u3002CNAME\u30ec\u30b3\u30fc\u30c9\u304c\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u306b\u306a\u3063\u3066\u3044\u308b\u3068rrname\u5185\u306e\u30c9\u30e1\u30a4\u30f3\u540d\u304c\u653b\u6483\u8005\u306b\u30cf\u30a4\u30b8\u30e3\u30c3\u30af\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u305f\u3068\u3048\u3070\u3001\u4ee5\u4e0b\u306e<a href=\"https:\/\/en.wikipedia.org\/wiki\/CNAME_record\">CNAME\u30ec\u30b3\u30fc\u30c9<\/a>\u3067\u306f\u3001<span style=\"font-family: 'courier new', courier, monospace;\">dangling.example[.]com<\/span>\u304c\u671f\u9650\u5207\u308c\u30c9\u30e1\u30a4\u30f3\u3092\u6307\u3057\u3066\u3044\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u3053\u306eCNAME\u30ec\u30b3\u30fc\u30c9\u306f\u30be\u30fc\u30f3\u30d5\u30a1\u30a4\u30eb\u304b\u3089\u524a\u9664\u3057\u3066\u304a\u304f\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u3046\u3057\u306a\u3044\u3068\u3001\u671f\u9650\u5207\u308c\u30c9\u30e1\u30a4\u30f3expired[.]com\u304c\u653b\u6483\u8005\u306b\u3088\u3063\u3066\u767b\u9332\u3055\u308c\u305f\u5834\u5408\u306b<span style=\"font-family: 'courier new', courier, monospace;\">dangling.example[.]com<\/span>\u304c\u30cf\u30a4\u30b8\u30e3\u30c3\u30af\u3055\u308c\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n<p style=\"text-align: center;\"><span style=\"font-family: 'courier new', courier, monospace;\">dangling.example[.]com CNAME expired[.]com<\/span><\/p>\n<p>MX\u30ec\u30b3\u30fc\u30c9\u306f\u3001rrname\u5185\u306e\u30c9\u30e1\u30a4\u30f3\u5b9b\u306e\u30e1\u30fc\u30eb\u3092\u53d7\u4fe1\u3059\u308b\u8cac\u4efb\u306e\u3042\u308b\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u3092\u6307\u5b9a\u3057\u307e\u3059\u30021\u3064\u306e\u30c9\u30e1\u30a4\u30f3\u306b\u8907\u6570\u306e\u512a\u5148\u9806\u4f4d\u306e\u7570\u306a\u308bMX\u30ec\u30b3\u30fc\u30c9\u3092\u6307\u5b9a\u3067\u304d\u307e\u3059\u3002\u305d\u306e\u4e2d\u3067\u512a\u5148\u5ea6\u306e\u9ad8\u3044MX\u30ec\u30b3\u30fc\u30c9\u304b\u3089\u5148\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0MX\u30ec\u30b3\u30fc\u30c9\u304c\u30cf\u30a4\u30b8\u30e3\u30c3\u30af\u3055\u308c\u308b\u3068\u3001\u653b\u6483\u8005\u306frrname\u5185\u306b\u3042\u308b\u5bfe\u8c61\u30c9\u30e1\u30a4\u30f3\u306e\u30e1\u30fc\u30eb\u3092\u9001\u53d7\u4fe1\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>NS\u30ec\u30b3\u30fc\u30c9\u306f\u3001\u30c9\u30e1\u30a4\u30f3\uff08rrname\uff09\u3092\u6a29\u5a01DNS\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc\uff08authoritative DNS\uff09\u306b\u59d4\u4efb\u3057\u3001\u305d\u306e\u30c9\u30e1\u30a4\u30f3\u4e0b\u306e\u540d\u524d\u306b\u95a2\u3059\u308b\u554f\u3044\u5408\u308f\u305b\u306b\u5fdc\u7b54\u3055\u305b\u307e\u3059\u3002\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0NS\u30ec\u30b3\u30fc\u30c9\u304c\u60aa\u7528\u3055\u308c\u308b\u3068\u3001\u653b\u6483\u8005\u306f\u6a29\u5a01DNS\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc\u3092\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u3057\u3066\u3001\u3059\u3079\u3066\u306e\u30c9\u30e1\u30a4\u30f3\u306e\u8a2a\u554f\u8005\u3092\u4efb\u610f\u306eIP\u30a2\u30c9\u30ec\u30b9\u306b\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002\u3055\u3089\u306b\u60aa\u3044\u3053\u3068\u306b\u3001DNS\u306b\u7d44\u307f\u8fbc\u307e\u308c\u3066\u3044\u308b\u63a8\u79fb\u7684\u4fe1\u983c\u306b\u3088\u308a\u3001\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0NS\u30ec\u30b3\u30fc\u30c9\u306b\u76f4\u63a5\u307e\u305f\u306f\u9593\u63a5\u7684\u306b\u4f9d\u5b58\u3059\u308b\u3059\u3079\u3066\u306e\u30c9\u30e1\u30a4\u30f3\u304c\u8106\u5f31\u306b\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u30c9\u30e1\u30a4\u30f3\u306b\u306f\u901a\u5e38NS\u30ec\u30b3\u30fc\u30c9\u304c\u8907\u6570\u3042\u308a\u3001DNS\u30ea\u30be\u30eb\u30d0\u306f\u3069\u306eNS\u30ec\u30b3\u30fc\u30c9\u3092\u4f7f\u7528\u3059\u308b\u304b\u3092<a href=\"https:\/\/dl.acm.org\/doi\/10.1145\/2185376.2185387\">\u3055\u307e\u3056\u307e\u306a\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0<\/a>\u3067\u6c7a\u3081\u3066\u3044\u307e\u3059\u3002\u8907\u6570\u306eNS\u30ec\u30b3\u30fc\u30c9\u306e1\u3064\u304c\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u306b\u306a\u308c\u3070\u3001\u653b\u6483\u8005\u306f\u30b5\u30fc\u30d3\u30b9\u62d2\u5426\u3084<a href=\"https:\/\/ieeexplore.ieee.org\/document\/6682711\">NS\u30d4\u30f3\u30cb\u30f3\u30b0<\/a>\u306a\u3069\u306e\u6280\u8853\u3092\u5229\u7528\u3057\u3066\u3001DNS\u30ea\u30be\u30eb\u30d0\u306b\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0NS\u30ec\u30b3\u30fc\u30c9\u3092\u4f7f\u7528\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2>\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u306e\u30cf\u30a4\u30b8\u30e3\u30c3\u30af<\/h2>\n<p>\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30ec\u30b3\u30fc\u30c9\u306f\u3001\u653e\u68c4\u3055\u308c\u305f\u30ea\u30bd\u30fc\u30b9\u304c\u30c9\u30e1\u30a4\u30f3\u6240\u6709\u8005\u4ee5\u5916\u306b\u64cd\u4f5c\u3055\u308c\u306a\u3044\u9650\u308a\u306f\u5b89\u5168\u3067\u3059\u3002\u305d\u3046\u3067\u306a\u3044\u3082\u306e\u306f\u5b89\u5168\u3067\u306f\u306a\u3044\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30ec\u30b3\u30fc\u30c9\u3068\u306a\u308a\u307e\u3059\u3002\u4ee5\u524d<a href=\"https:\/\/dl.acm.org\/doi\/10.1145\/2976749.2978387\">\u300cAll Your DNS Records Point to Us\uff08\u541b\u9054\u306eDNS\u30ec\u30b3\u30fc\u30c9\u306f\u5168\u3066\u79c1\u305f\u3061\u306b\u5411\u3051\u3066\u3044\u305f\u3060\u3044\u305f\u3002\uff09\u300d<\/a>\u3068\u3044\u3046\u7814\u7a76\u3067\u3001\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30ec\u30b3\u30fc\u30c9\u306e\u60aa\u7528\u306b\u5229\u7528\u3057\u3046\u308b\u8907\u6570\u306e\u65b9\u6cd5\u304c\u516c\u958b\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u3053\u3067\u306f\uff0crdata\u304c\u30c9\u30e1\u30a4\u30f3\u3067\u3042\u308b\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30ec\u30b3\u30fc\u30c9\u7528\u306e2\u3064\u306e\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n<p>\u7b2c1\u306e\u65b9\u6cd5\u306f\u3001\u88681\u306e3\u3064\u306eDNS\u30ec\u30b3\u30fc\u30c9\u30bf\u30a4\u30d7\u306erdata\u304c\u3059\u3079\u3066\u30c9\u30e1\u30a4\u30f3\u540d\u3067\u3042\u308b\u5834\u5408\u306b\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002rdata\u306e\u30c9\u30e1\u30a4\u30f3\u306f\u671f\u9650\u5207\u308c\u306b\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u3001\u8d77\u6e90\u304c\u5207\u308c\u308c\u3070\u653b\u6483\u8005\u304c\u518d\u767b\u9332\u53ef\u80fd\u3067\u3059\u3002\u671f\u9650\u5207\u308c\u306erdata\u3092\u767b\u9332\u3059\u308b\u3053\u3068\u306f\u3001\u4ee5\u524d\u306e\u671f\u9650\u5207\u308c\u30c9\u30e1\u30a4\u30f3\u81ea\u4f53\u306b\u6b8b\u308b\u4fe1\u983c\u6027\u3092\u5229\u7528\u3057\u305f\u653b\u6483\u3068\u306f\u5927\u304d\u304f\u7570\u306a\u308a\u307e\u3059\u3002\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u306e\u30cf\u30a4\u30b8\u30e3\u30c3\u30af\u3067\u306f\u3001\u653b\u6483\u8005\u306f\u304b\u308f\u308a\u306b\u671f\u9650\u5207\u308c\u3067\u306f\u306a\u3044rrname\u306e\u4fe1\u983c\u3092\u60aa\u7528\u3057\u307e\u3059\u3002\u30c9\u30e1\u30a4\u30f3\u30aa\u30fc\u30ca\u30fc\u304c\u3053\u3046\u3057\u305f\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30ec\u30b3\u30fc\u30c9\u3092\u653e\u7f6e\u3057\u3066\u3057\u307e\u3046\u7406\u7531\u306f\u3044\u304f\u3064\u304b\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u7406\u7531\u306e1\u3064\u304c\u3001\u901a\u5e38\u306f\u8907\u6570\u3042\u308bMX\/NS\u30ec\u30b3\u30fc\u30c9\u306e\u4e00\u90e8\u304c\u307e\u3060\u6a5f\u80fd\u3057\u3066\u3044\u3066\u3001\u3053\u308c\u3089MX\/NS\u30ec\u30b3\u30fc\u30c9\u306b\u4f9d\u5b58\u3059\u308b\u30b5\u30fc\u30d3\u30b9\u304c\u4e2d\u65ad\u3055\u308c\u306a\u3044\u3088\u3046\u306b\u3057\u3066\u3044\u308b\u5834\u5408\u304c\u3042\u308b\u3053\u3068\u3067\u3059\u3002\u3082\u30461\u3064\u3088\u304f\u3042\u308b\u7406\u7531\u306f\u3001\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30ec\u30b3\u30fc\u30c9\u304c\u6307\u3057\u793a\u3059\u30b5\u30fc\u30d3\u30b9\u306f\u3059\u3067\u306b\u4f7f\u7528\u3055\u308c\u3066\u304a\u3089\u305a\u3001\u308f\u3056\u308f\u3056\u305d\u306e\u30ec\u30b3\u30fc\u30c9\u3092\u66f4\u65b0\u3059\u308b\u4eba\u304c\u3044\u306a\u3044\u5834\u5408\u304c\u3042\u308b\u3053\u3068\u3067\u3059\u3002<\/p>\n<p>\u7b2c2\u306e\u65b9\u6cd5\u306f\u3001\u653e\u68c4\u3055\u308c\u305f\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u306e\u30b5\u30fc\u30d3\u30b9\u3092\u5229\u7528\u3059\u308b\u3082\u306e\u3067\u3059\uff08\u56f31\u53c2\u7167\uff09\u3002\u6700\u8fd1\u306eWeb\u30b5\u30a4\u30c8\u3067\u306f\u3001\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u306e\u30b5\u30fc\u30d3\u30b9\u304c\u591a\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u305f\u3068\u3048\u3070<a href=\"https:\/\/en.wikipedia.org\/wiki\/Virtual_hosting\">\u30d0\u30fc\u30c1\u30e3\u30eb\u30db\u30b9\u30c6\u30a3\u30f3\u30b0<\/a>\u3068\u3044\u3046\u624b\u6cd5\u3092\u4f7f\u3063\u3066\u30db\u30fc\u30e0\u30da\u30fc\u30b8\u3092\u69cb\u7bc9\u3059\u308b\u306e\u306bGitHub\u3084WordPress\u304c\u5e83\u304f\u4f7f\u308f\u308c\u3066\u3044\u307e\u3059\u3002\u30e6\u30fc\u30b6\u30fc\u306f\u305d\u308c\u3089\u30b5\u30fc\u30d3\u30b9\u306eDNS\u30be\u30fc\u30f3\u30d5\u30a1\u30a4\u30eb\u306bDNS\u30ec\u30b3\u30fc\u30c9\u3092\u8ffd\u52a0\u3057\u3001\u30ab\u30b9\u30bf\u30e0\u30c9\u30e1\u30a4\u30f3\u3092\u30b5\u30fc\u30d3\u30b9\u304c\u30db\u30b9\u30c8\u3055\u308c\u308b\u30c9\u30e1\u30a4\u30f3\u307e\u305f\u306fIP\u30a2\u30c9\u30ec\u30b9\u306b\u5411\u3051\u307e\u3059\u3002<\/p>\n<p>\u305f\u3068\u3048\u3070\u3001\u30e6\u30fc\u30b6\u30fc\u304cWordPress\u3092\u4f7f\u3063\u305f\u30db\u30fc\u30e0\u30da\u30fc\u30b8\u3092\u30c9\u30e1\u30a4\u30f3<span style=\"font-family: 'courier new', courier, monospace;\">blog.mydom[.]com<\/span>\u306b\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u3057\u305f\u3044\u3068\u3057\u307e\u3059\u3002\u305d\u306e\u5834\u5408\u3001\u30e6\u30fc\u30b6\u30fc\u306f<span style=\"font-family: 'courier new', courier, monospace;\">mydom[.]com<\/span>\u306e\u30be\u30fc\u30f3\u30d5\u30a1\u30a4\u30eb\u306b\u4ee5\u4e0b\u306e\u30ec\u30b3\u30fc\u30c9\u3092\u8ffd\u52a0\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p style=\"text-align: center;\"><span style=\"font-family: 'courier new', courier, monospace;\">blog.mydom[.]com CNAME example.wordpress[.]com<\/span><\/p>\n<p><span style=\"font-family: 'courier new', courier, monospace;\">example.wordpress[.]com<\/span>\u306f\u3001WordPress\u304c\u5272\u308a\u5f53\u3066\u305f\u30c9\u30e1\u30a4\u30f3\u540d\u3067\u3059\u3002\u307e\u305f\u3001CNAME\u30ec\u30b3\u30fc\u30c9\u306e\u4ee3\u308f\u308a\u306bA\u30ec\u30b3\u30fc\u30c9\u3092\u8ffd\u52a0\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<p style=\"text-align: center;\"><span style=\"font-family: 'courier new', courier, monospace;\">blog.mydom[.]com A 192[.]0.78.24<\/span><\/p>\n<p>\u305d\u306e\u4e0a\u3067\u3001<span style=\"font-family: 'courier new', courier, monospace;\">blog.mydom[.]com<\/span>\u304c\u3053\u306e\u30e6\u30fc\u30b6\u30fc\u306eWordPress\u30a2\u30ab\u30a6\u30f3\u30c8\u306e\u3082\u306e\u3067\u3042\u308b\u3068\u7533\u3057\u7acb\u3066\u308b\u3053\u3068\u3067\u3053\u306e\u30c9\u30e1\u30a4\u30f3\u3078\u306e\u3059\u3079\u3066\u306e\u30a2\u30af\u30bb\u30b9\u306f\u30d0\u30fc\u30c1\u30e3\u30eb\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u6280\u8853\u3067WordPress\u306b\u8a2d\u5b9a\u3055\u308c\u305fWeb\u30b5\u30a4\u30c8\u306b\u8a98\u5c0e\u3055\u308c\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u5f8c\u306b\u306a\u3063\u3066\u3001\u3053\u306e\u30e6\u30fc\u30b6\u30fc\u304cWordPress\u306f\u3082\u3046\u4f7f\u308f\u306a\u3044\u3067\u304a\u3053\u3046\u3068\u8003\u3048\u305f\u5834\u5408\u3001<span style=\"font-family: 'courier new', courier, monospace;\">blog.mydom[.]com<\/span>\u306e\u6240\u6709\u8005\u304c\u305d\u306eWordPress\u30a2\u30ab\u30a6\u30f3\u30c8\u3067\u3042\u308b\u3068\u307f\u306a\u3055\u308c\u306a\u304f\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u5834\u5408\u3001\u4e0a\u8a18\u306e <span style=\"font-family: 'courier new', courier, monospace;\">CNAME <span style=\"font-family: georgia, palatino, serif;\">\u306a\u3044\u3057<\/span> A <\/span>DNS\u30ec\u30b3\u30fc\u30c9\u3092<span style=\"font-family: 'courier new', courier, monospace;\">mydom.com<\/span>\u306e\u30be\u30fc\u30f3\u30d5\u30a1\u30a4\u30eb\u304b\u3089\u524a\u9664\u3057\u306a\u3044\u3068\u305d\u306e\u30ec\u30b3\u30fc\u30c9\u304c\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u72b6\u614b\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u306e\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30ec\u30b3\u30fc\u30c9\u3092\u60aa\u7528\u3057\u305f\u3044\u653b\u6483\u8005\u306f\u3001\u5358\u306bWordPress\u30a2\u30ab\u30a6\u30f3\u30c8\u3092\u767b\u9332\u3057\u3066\u653b\u6483\u8005\u306eWordPress\u30a2\u30ab\u30a6\u30f3\u30c8\u3067<span style=\"font-family: 'courier new', courier, monospace;\">blog.mydom[.]com<\/span>\u306e\u6240\u6709\u6a29\u3092\u7533\u3057\u7acb\u3066\u308b\u3060\u3051\u3067\u3088\u3044\u306e\u3067\u3059\u3002\u653b\u6483\u8005\u306f<span style=\"font-family: 'courier new', courier, monospace;\">example.wordpress[.]com<\/span>\u306f\u6240\u6709\u3057\u3066\u3044\u307e\u305b\u3093\u304c\u3001<span style=\"font-family: 'courier new', courier, monospace;\">blog.mydom[.]com<\/span>\u3078\u306e\u3059\u3079\u3066\u306e\u30a2\u30af\u30bb\u30b9\u306f\u3001\u653b\u6483\u8005\u304cWordPress\u4e0a\u306b\u8a2d\u5b9a\u3057\u305fWeb\u30b5\u30a4\u30c8\u306b\u8a98\u5c0e\u3055\u308c\u307e\u3059\u3002\u5b9f\u969b\u306b\u306f\u3001\u30d0\u30fc\u30c1\u30e3\u30eb\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u3067\u306fHTTP\u30ea\u30af\u30a8\u30b9\u30c8\u5185\u306eHost\u30d5\u30a3\u30fc\u30eb\u30c9\uff08\u4f8b: <span style=\"font-family: 'courier new', courier, monospace;\">blog.mydom[.]com<\/span>\uff09\u3092\u4f7f\u3063\u3066\u7570\u306a\u308bWeb\u30b5\u30a4\u30c8\u3092\u30b5\u30fc\u30d3\u30b9\u3059\u308b\u3053\u3068\u304b\u3089\u3001rdata\u306b\u542b\u307e\u308c\u308b\u30c9\u30e1\u30a4\u30f3<span style=\"font-family: 'courier new', courier, monospace;\">example.wordpress[.]com<\/span>\u306f\u3053\u3053\u3067\u306f\u91cd\u8981\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u305d\u306e\u305f\u3081\u3001\u30e6\u30fc\u30b6\u30fc\u306fA\u30ec\u30b3\u30fc\u30c9\u3092\u4f7f\u3063\u3066\u3082\u3001WordPress\u304c\u6240\u6709\u3059\u308b\u540c\u3058IP\u30a2\u30c9\u30ec\u30b9\u3092\u6307\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u540c\u3058\u30ea\u30b9\u30af\u306fGitHub\u306b\u3082\u5f53\u3066\u306f\u307e\u308a\u307e\u3059\u3002GitHub\u306e<a href=\"https:\/\/docs.github.com\/en\/pages\/configuring-a-custom-domain-for-your-github-pages-site\/managing-a-custom-domain-for-your-github-pages-site\">\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb<\/a>\u306f\u3001\u300c\u5148\u306bGitHub Pages\u30b5\u30a4\u30c8\u306b\u30ab\u30b9\u30bf\u30e0\u30c9\u30e1\u30a4\u30f3\u3092\u8ffd\u52a0\u3057\u3066\u304b\u3089DNS\u30d7\u30ed\u30d0\u30a4\u30c0\u306b\u30ab\u30b9\u30bf\u30e0\u30c9\u30e1\u30a4\u30f3\u3092\u8a2d\u5b9a\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u3053\u306e\u9006\u3067 DNS \u30d7\u30ed\u30d0\u30a4\u30c0\u306b\u30ab\u30b9\u30bf\u30e0\u30c9\u30e1\u30a4\u30f3\u3092\u8a2d\u5b9a\u3057\u3066\u304b\u3089 GitHub Pages\u30b5\u30a4\u30c8\u306b\u30ab\u30b9\u30bf\u30e0\u30c9\u30e1\u30a4\u30f3\u3092\u8ffd\u52a0\u3057\u3066\u3057\u307e\u3046\u3068\u3001\u4ed6\u306e\u4eba\u304c\u3042\u306a\u305f\u306e\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u306e\u3072\u3068\u3064\u306b\u30b5\u30a4\u30c8\u3092\u30db\u30b9\u30c8\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u300d\u3068\u8aac\u660e\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p><figure id=\"attachment_120536\" aria-describedby=\"caption-attachment-120536\" style=\"width: 900px\" class=\"wp-caption aligncenter\"><img  class=\"wp-image-120537 lozad\"  data-src=\"https:\/\/unit42.paloaltonetworks.com\/wp-content\/uploads\/2021\/09\/word-image-42.png\" alt=\"\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306e\u30d6\u30e9\u30a6\u30b6\u304cWordPress\u3067\u30db\u30b9\u30c8\u3055\u308c\u3066\u3044\u308b\u30c9\u30e1\u30a4\u30f3\u306b\u30a2\u30af\u30bb\u30b9\u3057\u305f\u3068\u304d\u306e\u30ef\u30fc\u30af\u30d5\u30ed\u30fc\u56f3\u30b9\u30c6\u30c3\u30d7I: blog.mydom[.]com\u306eDNS\u89e3\u6c7a; \u30b5\u30d6\u30b9\u30c6\u30c3\u30d7\u3092\u542b\u3080\u30021 - DNS\u30af\u30a8\u30ea\u30012 - mydom[.]com\u306eDNS\u30be\u30fc\u30f3\u30013 - wordpress[.]com\u306eDNS\u30be\u30fc\u30f3\u30014 - DNS\u5fdc\u7b54\uff1b\u30b9\u30c6\u30c3\u30d7II\uff1ablog.mydom[.]com\u304c\u30db\u30b9\u30c8\u3055\u308c\u3066\u3044\u308bWordPress\u3078\u306eHTTP\u63a5\u7d9a\u3001\u30b5\u30d6\u30b9\u30c6\u30c3\u30d7\u3092\u542b\u3080\uff1a5\uff09\u3002)\u30db\u30b9\u30c8 blog.mydom[...]com - \u4eee\u60f3\u7684\u306b (\u30af\u30ec\u30fc\u30de\u30fc).wordpress[...]com \u306b\u3088\u3063\u3066\u30db\u30b9\u30c8\u3055\u308c\u3066\u304a\u308a\u3001\u3053\u308c\u306f\u6b63\u5f53\u306a\u3082\u306e\u3067\u3042\u308b\u53ef\u80fd\u6027\u3082\u3042\u308c\u3070\u3001\u653b\u6483\u8005\u306b\u3088\u3063\u3066\u4e3b\u5f35\u3055\u308c\u305f\u3082\u306e\u3067\u3042\u308b\u53ef\u80fd\u6027\u3082\u3042\u308a\u307e\u3059\u3002 \" width=\"900\" height=\"519\" \/><figcaption id=\"caption-attachment-120536\" class=\"wp-caption-text\">\u56f31 \u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306e\u30d6\u30e9\u30a6\u30b6\u304cWordPress\u3067\u30db\u30b9\u30c8\u3055\u308c\u3066\u3044\u308b\u30c9\u30e1\u30a4\u30f3\u306b\u30a2\u30af\u30bb\u30b9\u3057\u305f\u3068\u304d\u306e\u30ef\u30fc\u30af\u30d5\u30ed\u30fc\u56f3<\/figcaption><\/figure>\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u306e\u30cf\u30a4\u30b8\u30e3\u30c3\u30af\u306f\u3001\u8a50\u6b3a\u3084\u30d5\u30a3\u30c3\u30b7\u30f3\u30b0\u306e\u52b9\u679c\u3092\u8457\u3057\u304f\u9ad8\u3081\u307e\u3059\u3002\u653b\u6483\u8005\u304c\u3088\u304f\u4f7f\u3046\u624b\u53e3\u306f\u3001\u8a55\u5224\u306e\u826f\u3044\u30c9\u30e1\u30a4\u30f3\u3092\u767b\u9332\u3059\u308b\u65b9\u6cd5\u3084\u3001<a href=\"https:\/\/unit42.paloaltonetworks.jp\/cybersquatting\/\">\u30c9\u30e1\u30a4\u30f3\u306e\u30b9\u30af\u30ef\u30c3\u30c6\u30a3\u30f3\u30b0<\/a>\u3067\u898b\u3089\u308c\u308b\u3088\u3046\u306a\u3001\u3088\u304f\u77e5\u3089\u308c\u305f\u6b63\u898f\u306e\u30c9\u30e1\u30a4\u30f3\u306b\u4f3c\u305f\u30c9\u30e1\u30a4\u30f3\u3092\u4f7f\u7528\u3059\u308b\u65b9\u6cd5\u3067\u3059\u3002\u3057\u304b\u3057\u3001\u3053\u308c\u3089\u306e\u6280\u8853\u306f\u6709\u52b9\u6027\u304c\u9650\u3089\u308c\u3066\u304a\u308a\u3001\u8b66\u6212\u5fc3\u306e\u5f37\u3044\u30e6\u30fc\u30b6\u30fc\u3067\u3042\u308c\u3070\u7c21\u5358\u306b\u898b\u629c\u3051\u307e\u3059\u3002\u3055\u3089\u306b\u3053\u308c\u3089\u306e\u60aa\u610f\u306e\u3042\u308b\u30c9\u30e1\u30a4\u30f3\u3092\u691c\u51fa\u3059\u308b\u305f\u3081\u306b\u3001<a href=\"https:\/\/unit42.paloaltonetworks.jp\/proactive-detector\/\">\u30d7\u30ed\u30a2\u30af\u30c6\u30a3\u30d6\u306a\u60aa\u610f\u306e\u3042\u308bNRD\u691c\u51fa\u5668<\/a>\u3084<a href=\"https:\/\/unit42.paloaltonetworks.jp\/cybersquatting\/\">\u30c9\u30e1\u30a4\u30f3\u30b9\u30af\u30ef\u30c3\u30c6\u30a3\u30f3\u30b0\u306e\u691c\u51fa\u5668<\/a>\u306a\u3069\u3001\u591a\u304f\u306e\u81ea\u52d5\u30b7\u30b9\u30c6\u30e0\u304c\u5b9f\u50cd\u74b0\u5883\u306b\u5c0e\u5165\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u4e00\u65b9\u3001\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u306e\u30cf\u30a4\u30b8\u30e3\u30c3\u30af\u3067\u306f\u3001\u653b\u6483\u8005\u306f\u5c65\u6b74\u306e\u304d\u308c\u3044\u306a\u30c9\u30e1\u30a4\u30f3\u3092\u304a\u624b\u9803\u4fa1\u683c\u3067\u7c21\u5358\u306b\u60aa\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3068\u304f\u306b\u3001\u3053\u308c\u3089\u306e\u30cf\u30a4\u30b8\u30e3\u30c3\u30af\u3055\u308c\u305f\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u3067\u306f\u3001whois\u60c5\u5831\u304c\u5909\u308f\u308a\u307e\u305b\u3093\u3002\u3055\u3089\u306b\u60aa\u3044\u3053\u3068\u306b\u3001\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u3055\u308c\u305f\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u306f\u3001\u89aa\u30c9\u30e1\u30a4\u30f3\u306e\u8a55\u5224\u3092\u5f15\u304d\u7d99\u3050\u3053\u3068\u304c\u591a\u304f\u3001\u305d\u306e\u4e2d\u306b\u306f\u6709\u540d\u3067\u8a55\u5224\u306e\u826f\u3044\u3082\u306e\u3082\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u5b89\u5168\u3067\u306a\u3044\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u304b\u3089\u30e6\u30fc\u30b6\u30fc\u3092\u4fdd\u8b77\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n<h2>\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u306e\u691c\u51fa<\/h2>\n<p>\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u3092\u30cf\u30a4\u30b8\u30e3\u30c3\u30af\u3059\u308b\u30c6\u30af\u30cb\u30c3\u30af\u304c\u308f\u304b\u308c\u3070\u3001\u691c\u51fa\u5668\u306e\u5b9f\u88c5\u306f\u7c21\u5358\u3067\u3059\u3002rdata\u306b\u767b\u9332\u3055\u308c\u3066\u3044\u308b\u30c9\u30e1\u30a4\u30f3\u306b\u3064\u3044\u3066\u306f\u3001\u30c9\u30e1\u30a4\u30f3\u306e\u6709\u52b9\u671f\u9650\u304c\u5207\u308c\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3092\u8abf\u3079\u307e\u3059\u3002\u305d\u306e\u5834\u5408\u3001\u305d\u306eDNS\u30ec\u30b3\u30fc\u30c9\u306f\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u72b6\u614b\u3067\u3059\u3002rdata\u304c\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u306e\u30b5\u30fc\u30d3\u30b9\u3092\u793a\u3057\u3066\u3044\u308b\u5834\u5408\u306f\u3001\u5bfe\u5fdc\u3059\u308b\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u306e\u30b5\u30fc\u30d3\u30b9\u3067\u305d\u306errname\u3092\u7533\u3057\u7acb\u3066\u53ef\u80fd\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002\u3042\u308b\u30c9\u30e1\u30a4\u30f3\u306f\u5e38\u306b\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u306b\u306a\u308a\u3046\u308b\u306e\u3067\u3001\u6709\u52b9\u306aDNS\u30ec\u30b3\u30fc\u30c9\u304b\u3069\u3046\u304b\u3092\u5b9a\u671f\u7684\u306b\u30c1\u30a7\u30c3\u30af\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u691c\u51fa\u5668\u306f\u6570\u9031\u9593\u306b\u4e00\u5ea6\u3001\u30d1\u30c3\u30b7\u30d6DNS\u306e\u3059\u3079\u3066\u306e\u6709\u52b9\u306aDNS\u30ec\u30b3\u30fc\u30c9\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3066\u3044\u307e\u3059\u3002\u4e00\u65b9\u3001\u30e6\u30fc\u30b6\u30fc\u3092\u30bf\u30a4\u30e0\u30ea\u30fc\u306b\u4fdd\u8b77\u3059\u308b\u305f\u3081\u306b\u3001\u904e\u53bb1\u65e5\u306e\u9593\u306b\u6d3b\u767a\u306b\u7167\u4f1a\u3055\u308c\u305f\u3059\u3079\u3066\u306eDNS\u30ec\u30b3\u30fc\u30c9\u306e\u691c\u51fa\u3082\u6bce\u65e5\u884c\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2>\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u306e\u8513\u5ef6<\/h2>\n<p>\u5f0a\u793e\u306e\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u691c\u51fa\u5668\u3067\u306f\u3001\u5408\u8a0831\u4e077000\u4ef6\u306e\u5b89\u5168\u3067\u306a\u3044\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u3092\u691c\u51fa\u3057\u3066\u3044\u307e\u3059\u3002\u56f32\u306f\u3001\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u306e\u30bf\u30a4\u30d7\u5225\u5185\u8a33\u3092\u793a\u3057\u305f\u3082\u306e\u3067\u300163.1%\u304c\u671f\u9650\u5207\u308crdata\u300136.9%\u304cGitHub\u30010.1%\u304cWordPress\u3067\u3057\u305f\u3002\u307e\u305f\u3001\u56f33\u306fDNS\u30ec\u30b3\u30fc\u30c9\u30bf\u30a4\u30d7\u306e\u5206\u5e03\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u304c\u3001\u3053\u308c\u3089\u306e\u30ec\u30b3\u30fc\u30c9\u306e\u5927\u534a\u304cCNAME\u3067\u3042\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002\u610f\u5916\u306a\u3053\u3068\u306b\u3001\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0MX\u30ec\u30b3\u30fc\u30c9\u306f\u691c\u51fa\u3055\u308c\u307e\u305b\u3093\u3067\u3057\u305f\u3002\u3053\u308c\u306b\u306f2\u3064\u306e\u7406\u7531\u304c\u8003\u3048\u3089\u308c\u307e\u3059\u3002\u7b2c1\u306b\u5b9f\u969b\u306eMX\u30ec\u30b3\u30fc\u30c9\u306f\u305d\u306e\u307b\u3068\u3093\u3069\u304c<a href=\"https:\/\/www.mailgun.com\/\">Mailgun<\/a>\u306e\u3088\u3046\u306a\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u306e\u30e1\u30fc\u30ea\u30f3\u30b0\u30b5\u30fc\u30d3\u30b9\u3092\u6307\u3057\u3066\u3044\u307e\u3059\u3002\u7b2c2\u306b\u4ee5\u524d\u306e\u7814\u7a76\u306b\u3088\u308c\u3070\u671f\u9650\u5207\u308crdata\u304b\u3089\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0MX\u30ec\u30b3\u30fc\u30c9\u306b\u3064\u306a\u304c\u308b\u3053\u3068\u306f\u5b9f\u969b\u306b\u306f\u7a00\u3067\u3042\u308b\u3053\u3068\u3067\u3059\u3002<\/p>\n<figure id=\"attachment_120538\" aria-describedby=\"caption-attachment-120538\" style=\"width: 900px\" class=\"wp-caption aligncenter\"><img  class=\"wp-image-120539 lozad\"  data-src=\"https:\/\/unit42.paloaltonetworks.com\/wp-content\/uploads\/2021\/09\/points-scored.png\" alt=\"\u30c9\u30e1\u30a4\u30f3\u30bf\u30a4\u30d7\u306e\u5185\u8a33 - 63.1%\u304c\u671f\u9650\u5207\u308c\u306erdata\u300136.9%\u304cGitHub\u30010.1%\u304cWordPress\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002 \" width=\"900\" height=\"498\" \/><figcaption id=\"caption-attachment-120538\" class=\"wp-caption-text\">\u56f32 \u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u30bf\u30a4\u30d7\u306e\u5185\u8a33<\/figcaption><\/figure>\n<figure id=\"attachment_120540\" aria-describedby=\"caption-attachment-120540\" style=\"width: 900px\" class=\"wp-caption aligncenter\"><img  class=\"wp-image-120541 lozad\"  data-src=\"https:\/\/unit42.paloaltonetworks.com\/wp-content\/uploads\/2021\/09\/points-scored-1.png\" alt=\"DNS\u30ec\u30b3\u30fc\u30c9\u30bf\u30a4\u30d7\u306e\u5206\u5e03 - CNAME 99.4%, NS 0.6\" width=\"900\" height=\"557\" \/><figcaption id=\"caption-attachment-120540\" class=\"wp-caption-text\">\u56f33 DNS\u30ec\u30b3\u30fc\u30c9\u30bf\u30a4\u30d7\u306e\u5206\u5e03<\/figcaption><\/figure>\n<p>\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u306e\u8513\u5ef6\u3092\u628a\u63e1\u3059\u308b\u305f\u3081\u306b\u30015\u670822\u65e5\u304b\u30896\u670821\u65e5\u307e\u3067\u306e\u30d1\u30c3\u30b7\u30d6DNS\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3001\u3069\u308c\u3060\u3051\u306e\u6570\u306e\u30c9\u30e1\u30a4\u30f3\u304c\u30a2\u30af\u30c6\u30a3\u30d6\u306b\u7167\u4f1a\u3055\u308c\u3066\u3044\u308b\u304b\u3092\u8abf\u3079\u307e\u3057\u305f\u300288\u500b\u306e\u30ef\u30a4\u30eb\u30c9\u30ab\u30fc\u30c9\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u3092\u9664\u5916\u3057\u305f\u306e\u306f\u3001\u305d\u308c\u3089\u306e\u30de\u30c3\u30c1\u30f3\u30b0\u306b\u306f\u8a08\u7b97\u30b3\u30b9\u30c8\u304c\u304b\u304b\u308a\u3059\u304e\u308b\u305f\u3081\u3067\u3059\u3002\u65e5\u5225\u3067\u89e3\u6c7a\u3055\u308c\u305f\u30e6\u30cb\u30fc\u30af\u306a\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u6570\u3092\u56f34\u306b\u793a\u3057\u307e\u3059\u3002\u6bce\u65e5\u6570\u5343\u306e\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u304c\u7167\u4f1a\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002\u56f34\u3067\u306f\u30012021-06-09\u30682021-06-12\u306b2\u3064\u306e\u30b9\u30d1\u30a4\u30af\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u3055\u3089\u306b\u5206\u6790\u3059\u308b\u3068\u3001\u3053\u306e\u30b9\u30d1\u30a4\u30af\u306f\u3042\u308b1\u3064\u306e\u30c9\u30e1\u30a4\u30f3\u306b\u3088\u3063\u3066\u30c8\u30ea\u30ac\u30fc\u3055\u308c\u3066\u3044\u3066\u3001\u3053\u306e\u30c9\u30e1\u30a4\u30f3\u304c\u3053\u306e2\u65e5\u9593\u306711,000\u4ee5\u4e0a\u306e\u4e00\u610f\u306a\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u3092\u7167\u4f1a\u3057\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3057\u305f\u3002<\/p>\n<figure id=\"attachment_120542\" aria-describedby=\"caption-attachment-120542\" style=\"width: 900px\" class=\"wp-caption aligncenter\"><img  class=\"wp-image-120543 lozad\"  data-src=\"https:\/\/unit42.paloaltonetworks.com\/wp-content\/uploads\/2021\/09\/chart-1.png\" alt=\"5\u670822\u65e5\u304b\u30896\u670821\u65e5\u307e\u3067\u306e\u5404\u65e5\u306b\u89e3\u6c7a\u3055\u308c\u305f\u30e6\u30cb\u30fc\u30af\u306a\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u306e\u6570\u30021\u3064\u306e\u30c9\u30e1\u30a4\u30f3\u306b\u8d77\u56e0\u3059\u308b2\u3064\u306e\u30b9\u30d1\u30a4\u30af\uff086\u67089\u65e5\u30686\u670812\u65e5\uff09\u3092\u542b\u307f\u3001\u3053\u306e2\u65e5\u9593\u306711,000\u4ee5\u4e0a\u306e\u30e6\u30cb\u30fc\u30af\u306a\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u306b\u76f8\u5f53\u3059\u308b\u3002 \" width=\"900\" height=\"309\" \/><figcaption id=\"caption-attachment-120542\" class=\"wp-caption-text\">\u56f34 5\u670822\u65e5\u304b\u30896\u670821\u65e5\u307e\u3067\u306b\u89e3\u6c7a\u3055\u308c\u305f\u4e00\u610f\u306a\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u6570\uff08\u65e5\u5225\uff09<\/figcaption><\/figure>\n<p>\u3053\u308c\u3089\u306e\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u306e\u30ea\u30b9\u30af\u3092\u7406\u89e3\u3059\u308b\u305f\u3081\u306b\u300131\u4e077000\u4ef6\u306e\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u3092TLD\u5225\u306b\u96c6\u8a08\u3057\u3001\u4e0a\u4f4d60\u306eTLD\u3092\u56f35\u306b\u793a\u3057\u307e\u3057\u305f\u3002\u6700\u3082\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u304c\u591a\u304b\u3063\u305fTLD\u306f<span style=\"font-family: 'courier new', courier, monospace;\">com<\/span>\u3067\u3001\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u5168\u4f53\u306e55.2%\u3092\u5360\u3081\u3066\u3044\u307e\u3059\u3002\u3068\u304f\u306b\u8208\u5473\u90e8\u304b\u304b\u3063\u305f\u306e\u304c <span style=\"font-family: 'courier new', courier, monospace;\">edu<\/span>\u3068<span style=\"font-family: 'courier new', courier, monospace;\">gov<\/span>\u306eTLD\u3067\u3059\u3002\u3053\u308c\u3089\u306f\u3088\u304f\u7ba1\u7406\u3055\u308c\u3066\u3044\u308bDNS\u30be\u30fc\u30f3\u3068\u898b\u306a\u3055\u308c\u3066\u3044\u307e\u3059\u304c\uff08<a href=\"https:\/\/en.wikipedia.org\/wiki\/.edu#Eligibility\">\u8cc7\u683c<\/a>\u8981\u4ef6\u3084\u65b0\u898f\u30c9\u30e1\u30a4\u30f3\u767b\u9332\u306e<a href=\"https:\/\/home.dotgov.gov\/registration\/requirements\/\">\u53b3\u683c\u306a<\/a>\u30d7\u30ed\u30bb\u30b9\u9075\u5b88\u304c\u3055\u308c\u3066\u3044\u308b\uff09\u3001\u305d\u308c\u305e\u308c197\u4ef6\u306813\u4ef6\u306e\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u304c\u6b8b\u5b58\u3057\u3066\u3044\u307e\u3057\u305f\u3002\u3053\u308c\u306b\u3088\u308a\u653b\u6483\u8005\u306fedu\u3084gov\u3078\u306e\u4fe1\u983c\u3092\u60aa\u7528\u3057\u3001\u30d5\u30a3\u30c3\u30b7\u30f3\u30b0\u3084\u8a50\u6b3a\u306a\u3069\u306e\u653b\u6483\u3092\u884c\u3046\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3055\u3089\u306b\u3001\u3053\u308c\u3089\u306e\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u304c\u3001<a href=\"https:\/\/tranco-list.eu\/\">Tranco<\/a>\u306e\u4e0a\u4f4d100\u4e07\u30c9\u30e1\u30a4\u30f3\u306e\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3057\u305f\u3002\u305d\u3046\u3067\u3042\u308c\u3070\u3001\u305d\u308c\u3089\u306e\u30c9\u30e1\u30a4\u30f3\u306b\u306f\u63a8\u79fb\u7684\u4fe1\u983c\u304c\u3042\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u306e\u7d50\u679c\u30013\u4e078000\u4ef6\uff0812.0\uff05\uff09\u304cTranco\u306e\u30c8\u30c3\u30d7100\u4e07\u30c9\u30e1\u30a4\u30f3\u4ee5\u4e0b\u306b\u3042\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3057\u305f\u3002\u56f36\u306f\u3001\u305d\u308c\u3089\u30c9\u30e1\u30a4\u30f3\u306eTranco\u30e9\u30f3\u30af\u306e\u5206\u5e03\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002\u3068\u304f\u306b\u30014,767\u4ef6\u306e\u30c9\u30e1\u30a4\u30f3\u306f\u30c8\u30e9\u30f3\u30af\u30c8\u30c3\u30d72,000\u4f4d\u4ee5\u5185\u306e\u30c9\u30e1\u30a4\u30f3\u3067\u3059\u3002<\/p>\n<figure id=\"attachment_120544\" aria-describedby=\"caption-attachment-120544\" style=\"width: 900px\" class=\"wp-caption aligncenter\"><img  class=\"wp-image-120545 lozad\"  data-src=\"https:\/\/unit42.paloaltonetworks.com\/wp-content\/uploads\/2021\/09\/chart-2.png\" alt=\"31\u4e077000\u4ef6\u306e\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u3092TLD\u5225\u306b\u96c6\u8a08\u3057\u305f\u3082\u306e\u3067\u3059\uff08\u56f3\u306f\u4e0a\u4f4d60\u306eTLD\uff09\u3002 \" width=\"900\" height=\"235\" \/><figcaption id=\"caption-attachment-120544\" class=\"wp-caption-text\">\u56f35 TLD\u5225\u306b\u96c6\u8a08\u3055\u308c\u305f\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u6570<\/figcaption><\/figure>\n<figure id=\"attachment_120546\" aria-describedby=\"caption-attachment-120546\" style=\"width: 900px\" class=\"wp-caption aligncenter\"><img  class=\"wp-image-120547 lozad\"  data-src=\"https:\/\/unit42.paloaltonetworks.com\/wp-content\/uploads\/2021\/09\/points-scored-2.png\" alt=\"Tranco\u306e\u4e0a\u4f4d100\u4e07\u30c9\u30e1\u30a4\u30f3\u306e\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u3067\u3042\u308b3\u4e078000\u30c9\u30e1\u30a4\u30f3\u306eTranco\u30e9\u30f3\u30af\u5206\u5e03\" width=\"900\" height=\"451\" \/><figcaption id=\"caption-attachment-120546\" class=\"wp-caption-text\">\u56f36 Tranco\u306e\u4e0a\u4f4d100\u4e07\u30c9\u30e1\u30a4\u30f3\u306e\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u3067\u3042\u308b3\u4e078000\u30c9\u30e1\u30a4\u30f3\u306eTranco\u30e9\u30f3\u30af\u5206\u5e03<\/figcaption><\/figure>\n<h2>\u30b1\u30fc\u30b9\u30b9\u30bf\u30c7\u30a3<\/h2>\n<p>\u691c\u77e5\u7d50\u679c\u3092\u8a55\u4fa1\u3057\u305f\u3068\u3053\u308d\u3001\u8208\u5473\u6df1\u3044\u30b1\u30fc\u30b9\u3084\u30d1\u30bf\u30fc\u30f3\u304c\u591a\u6570\u898b\u3089\u308c\u307e\u3057\u305f\u3002\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3044\u304f\u3064\u304b\u306e\u4ee3\u8868\u7684\u306a\u4e8b\u4f8b\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n<h3><strong>\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u306f\u8457\u540d\u306a\u89aa\u30c9\u30e1\u30a4\u30f3\u304b\u3089\u306e\u4fe1\u983c\u3092\u5f15\u304d\u7d99\u3050<\/strong><\/h3>\n<p>DNS\u30b7\u30b9\u30c6\u30e0\u306e\u968e\u5c64\u69cb\u9020\u306b\u3088\u308a\u3001\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u306f\u901a\u5e38\u3001\u89aa\u30c9\u30e1\u30a4\u30f3\u304b\u3089\u306e\u4fe1\u983c\u3092\u5f15\u304d\u7d99\u304e\u3001\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u306b\u3082\u89aa\u30c9\u30e1\u30a4\u30f3\u3068\u540c\u3058\u4fe1\u983c\u6027\u304c\u4e0e\u3048\u3089\u308c\u308b\u3053\u3068\u304c\u591a\u304f\u3042\u308a\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001<span style=\"font-family: 'courier new', courier, monospace;\">edu<\/span>\u306e\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u3067\u30db\u30b9\u30c8\u3055\u308c\u3066\u3044\u308bWeb\u30b3\u30f3\u30c6\u30f3\u30c4\u306f\u3001\u5927\u5b66\u304b\u3089\u306e\u516c\u5f0f\u60c5\u5831\u3068\u307f\u306a\u3055\u308c\u307e\u3059\u3002\u3053\u306e\u3088\u3046\u306b\u3001\u8a55\u5224\u306e\u826f\u3044\u30c9\u30e1\u30a4\u30f3\u306e\u4e0b\u306b\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u3057\u3066\u3044\u308b\u30c9\u30e1\u30a4\u30f3\u306f\u3001\u653b\u6483\u8005\u306b\u3068\u3063\u3066\u306f\u975e\u5e38\u306b\u9b45\u529b\u7684\u3067\u3059\u3002\u4eca\u56de\u306e\u8abf\u67fb\u3067\u306f\u3001\u305d\u306e\u3088\u3046\u306a\u30b1\u30fc\u30b9\u304c\u8907\u6570\u898b\u3064\u304b\u308a\u307e\u3057\u305f\u3002\u56f37\u306b2\u3064\u306e\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n<figure id=\"attachment_120548\" aria-describedby=\"caption-attachment-120548\" style=\"width: 900px\" class=\"wp-caption aligncenter\"><img  class=\"wp-image-120549 lozad\"  data-src=\"https:\/\/unit42.paloaltonetworks.com\/wp-content\/uploads\/2021\/09\/word-image-43.png\" alt=\"edu\u4ee5\u4e0b\u306e\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f32\u4f8b\u3002\u4fdd\u8b77\u306e\u305f\u3081\u90e8\u5206\u7684\u306b\u60c5\u5831\u3092\u524a\u9664\u3057\u3066\u3044\u308b\u3002 \" width=\"900\" height=\"82\" \/><figcaption id=\"caption-attachment-120548\" class=\"wp-caption-text\">\u56f37 edu\u4ee5\u4e0b\u306e\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f32\u4f8b<\/figcaption><\/figure>\n<p>rrname\u306e2\u3064\u306e\u30c9\u30e1\u30a4\u30f3\u306f\u3001\u7c73\u56fd\u306e\u6709\u540d\u5927\u5b662\u6821\u304c\u6240\u6709\u3057\u3066\u3044\u308b\u3082\u306e\u3067\u3059\u3002\u3053\u308c\u3089\u306e\u30c9\u30e1\u30a4\u30f3\u3067\u30db\u30b9\u30c8\u3055\u308c\u3066\u3044\u308bWeb\u30b5\u30a4\u30c8\u3078\u306e\u8a2a\u554f\u8005\u306f\u3001\u305d\u306e\u60c5\u5831\u304c\u5927\u5b66\u304b\u3089\u306e\u6709\u52b9\u304b\u3064\u516c\u5f0f\u306a\u3082\u306e\u3067\u3042\u308b\u3068\u8003\u3048\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u7d50\u679c\u3001\u653b\u6483\u8005\u304c\u3053\u306e\u3088\u3046\u306a\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u3067\u60aa\u610f\u306e\u3042\u308b\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u30db\u30b9\u30c8\u3057\u305f\u308a\u3001\u30b9\u30d4\u30a2\u30d5\u30a3\u30c3\u30b7\u30f3\u30b0\u3092\u5b9f\u884c\u3057\u305f\u308a\u3059\u308b\u3068\u3001\u975e\u5e38\u306b\u8b66\u6212\u5fc3\u306e\u5f37\u3044\u30e6\u30fc\u30b6\u30fc\u3067\u3082\u88ab\u5bb3\u3092\u53d7\u3051\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h3><strong>\u30bf\u30a4\u30d7\u30df\u30b9\u306b\u3088\u308bDNS\u30ec\u30b3\u30fc\u30c9\u306e\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0<\/strong><\/h3>\n<p>\u30bf\u30a4\u30d7\u30df\u30b9\u306f\u3001\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u3067\u3088\u304f\u3042\u308b\u539f\u56e0\u3067\u3059\u3002rdata\u304c\u660e\u3089\u304b\u306b\u30bf\u30a4\u30d7\u30df\u30b9\u3067\u3042\u308b\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30ec\u30b3\u30fc\u30c9\u304c\u591a\u6570\u898b\u3064\u304b\u3063\u3066\u3044\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u56f38\u3067\u306f\u3001<span style=\"font-family: 'courier new', courier, monospace;\">CNAME<\/span> DNS\u30ec\u30b3\u30fc\u30c9\u306e<span style=\"font-family: 'courier new', courier, monospace;\">cdcr.[xxxxx.]edu<\/span>\u304c\u3001\u57f7\u7b46\u6642\u70b9\u3067\u671f\u9650\u5207\u308c\u3068\u306a\u3063\u3066\u3044\u308b<span style=\"font-family: 'courier new', courier, monospace;\">cloudlfare[.]net<\/span>\u4ee5\u4e0b\u306e\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u3092\u6307\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e<span style=\"font-family: 'courier new', courier, monospace;\">cloudlfare[.]net<\/span>\u3068\u3044\u3046\u306e\u306f\u3001CDN\uff08\u30b3\u30f3\u30c6\u30f3\u30c4\u30c7\u30ea\u30d0\u30ea\u30fc\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\uff09\u306a\u3069\u306eWeb\u95a2\u9023\u30b5\u30fc\u30d3\u30b9\u3092\u63d0\u4f9b\u3057\u3066\u3044\u308bcloudflare.net\u306e\u30bf\u30a4\u30d7\u30df\u30b9\u3067\u3042\u308b\u3068\u79c1\u305f\u3061\u306f\u9ad8\u3044\u78ba\u5ea6\u3067\u63a8\u6e2c\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<figure id=\"attachment_120550\" aria-describedby=\"caption-attachment-120550\" style=\"width: 826px\" class=\"wp-caption aligncenter\"><img  class=\"wp-image-120551 lozad\"  data-src=\"https:\/\/unit42.paloaltonetworks.com\/wp-content\/uploads\/2021\/09\/word-image-44.png\" alt=\"\u3053\u3053\u3067\u7d39\u4ecb\u3059\u308b\u90e8\u5206\u7684\u306b\u524a\u9664\u3057\u3066\u3042\u308b\u4f8b\u304b\u3089\u3082\u898b\u3089\u308c\u308b\u3088\u3046\u306b\u3001\u30bf\u30a4\u30d7\u30df\u30b9\u306f\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u306e\u4e00\u822c\u7684\u306a\u539f\u56e0\u3067\u3059\u3002\" width=\"826\" height=\"60\" \/><figcaption id=\"caption-attachment-120550\" class=\"wp-caption-text\">\u56f38 \u30bf\u30a4\u30d7\u30df\u30b9\u306f\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u306e\u4e00\u822c\u7684\u539f\u56e0<\/figcaption><\/figure>\n<p>\u79c1\u305f\u3061\u306f\u3001\u306a\u305c<span style=\"font-family: 'courier new', courier, monospace;\">cdcr.[xxxx.]edu<\/span>\u306e\u7ba1\u7406\u8005\u304c\u3053\u306e\u30a8\u30e9\u30fc\u306b\u6c17\u3065\u304b\u306a\u304b\u3063\u305f\u306e\u304b\u3092\u3082\u3046\u5c11\u3057\u6398\u308a\u4e0b\u3052\u3066\u8abf\u3079\u307e\u3057\u305f\u3002\u307e\u305a\u3001\u30aa\u30f3\u30e9\u30a4\u30f3\u3067\u898b\u3064\u3051\u305f\u60c5\u5831\u306b\u3088\u308b\u3068\u3001\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u306e<span style=\"font-family: 'courier new', courier, monospace;\">cdcr.[xxxx.]edu<\/span>\u306f\u3001\u304a\u305d\u3089\u304f\u5927\u5b66\u306e\u30b3\u30df\u30e5\u30cb\u30c6\u30a3\u306e1\u3064\u306e\u305f\u3081\u306e\u30db\u30fc\u30e0\u30da\u30fc\u30b8\u3067\u3059\u3002\u5f0a\u793e\u306e\u30d1\u30c3\u30b7\u30d6DNS\u30c7\u30fc\u30bf\u306b\u3088\u308b\u3068\u3001\u3053\u306e\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0DNS\u30ec\u30b3\u30fc\u30c9\u304c\u521d\u3081\u3066\u78ba\u8a8d\u3055\u308c\u305f\u306e\u306f2017\u5e7410\u670817\u65e5\u3067\u3057\u305f\u3002\u305d\u308c\u4ee5\u524d\u3001<span style=\"font-family: 'courier new', courier, monospace;\">cdcr.[xxxx.]edu<\/span>\u306fCNAME\u30ec\u30b3\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3066<span style=\"font-family: 'courier new', courier, monospace;\">webhost302.[xxxx.]edu<\/span>\u3092\u6307\u3057\u3066\u3044\u307e\u3057\u305f\u3002\u3053\u306e\u3053\u3068\u304b\u3089\u3001\u30c9\u30e1\u30a4\u30f3\u7ba1\u7406\u8005\u306f2017\u5e7410\u670817\u65e5\u306bCloudflare\u3078\u306e\u5207\u308a\u66ff\u3048\u3092\u610f\u56f3\u3057\u3066\u3044\u305f\u3068\u8003\u3048\u3089\u308c\u307e\u3059\u3002\u305d\u306e\u5f8c\u79c1\u305f\u3061\u306f\u3001<span style=\"font-family: 'courier new', courier, monospace;\">cloudlfare[.]net<\/span>\u306eWHOIS\u30c7\u30fc\u30bf\u3092\u62bd\u51fa\u3057\u307e\u3057\u305f\uff08\u56f39\u53c2\u7167\uff09\u3002\u3053\u306eDNS\u30ec\u30b3\u30fc\u30c9\u306e\u4f5c\u6210\u304b\u3089\u7d042\u30f6\u6708\u5f8c\u306e2017\u5e7412\u67087\u65e5\u306b\u30c9\u30e1\u30a4\u30f3\u304c\u767b\u9332\u3055\u308c\u305f\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002\u79c1\u305f\u3061\u306e\u624b\u5143\u306b\u3042\u308b<span style=\"font-family: 'courier new', courier, monospace;\">cloudlfare[.]net<\/span>\u306e\u30d1\u30c3\u30b7\u30d6DNS\u30c7\u30fc\u30bf\u306f\u3053\u306e\u767b\u9332\u65e5\u3068\u4e00\u81f4\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u3053\u3068\u304b\u3089\u3001<span style=\"font-family: 'courier new', courier, monospace;\">cdcr.[xxxx.]edu<\/span>\u304c<span style=\"font-family: 'courier new', courier, monospace;\">cdcr.[xxxx.]edu.cdn.cloudlfare[...]net<\/span>\u3092\u6307\u3057\u306f\u3058\u3081\u305f\u6642\u70b9\u3067\u306f\u307e\u3060<span style=\"font-family: 'courier new', courier, monospace;\">cloudlfare[...]net<\/span>\u306f\u304a\u305d\u3089\u304f\u767b\u9332\u3055\u308c\u3066\u304a\u3089\u305a\u3001\u3053\u306eDNS\u30ec\u30b3\u30fc\u30c9\u306f\u4f5c\u6210\u5f53\u6642\u304b\u3089\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u3057\u3066\u3044\u305f\u3068\u3044\u3046\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002\u3064\u307e\u308a<span style=\"font-family: 'courier new', courier, monospace;\">cdcr.[xxxx.]edu<\/span>\u306e\u7ba1\u7406\u8005\u304c\u306a\u305c\u3053\u306e\u30a8\u30e9\u30fc\u306b\u6c17\u3065\u304b\u306a\u304b\u3063\u305f\u306e\u304b\u306f\u4e0d\u660e\u3067\u3059\u3002<\/p>\n<figure id=\"attachment_120552\" aria-describedby=\"caption-attachment-120552\" style=\"width: 842px\" class=\"wp-caption aligncenter\"><img  class=\"wp-image-120553 lozad\"  data-src=\"https:\/\/unit42.paloaltonetworks.com\/wp-content\/uploads\/2021\/09\/word-image-45.png\" alt=\"cloudlfare[.]net\u306eWHOIS\u30c7\u30fc\u30bf\u304b\u3089\u3053\u306e\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0DNS\u30ec\u30b3\u30fc\u30c9\u304c\u4f5c\u6210\u306e\u7d042\u30f6\u6708\u5f8c\u306b\u30c9\u30e1\u30a4\u30f3\u767b\u9332\u3055\u308c\u305f\u3053\u3068\u304c\u308f\u304b\u308b\u3002 \" width=\"842\" height=\"378\" \/><figcaption id=\"caption-attachment-120552\" class=\"wp-caption-text\">\u56f39 cloudlfare[.]net\u306eWHOIS\u30c7\u30fc\u30bf<\/figcaption><\/figure>\n<h3><strong>\u671f\u9650\u5207\u308c\u30b5\u30fc\u30d3\u30b9\u3078\u306e\u4f9d\u5b58<\/strong><\/h3>\n<p>\u524d\u8ff0\u3057\u305f\u3088\u3046\u306b\u3001\u304b\u306a\u308a\u306e\u6570\u306e\u30c9\u30e1\u30a4\u30f3\u304c\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u30b5\u30fc\u30d3\u30b9\u3092\u6307\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u30b5\u30fc\u30d3\u30b9\u306f\u3001\u5ec3\u6b62\u3055\u308c\u308b\u3053\u3068\u3082\u3042\u308c\u3070\u30b5\u30fc\u30d3\u30b9\u63d0\u4f9b\u7528\u306e\u30c9\u30e1\u30a4\u30f3\u304c\u65b0\u3057\u3044\u3082\u306e\u306b\u79fb\u884c\u3059\u308b\u3053\u3068\u3082\u3042\u308a\u307e\u3059\u3002\u305d\u3046\u3057\u305f\u5834\u5408\u306b\u5143\u306e\u30c9\u30e1\u30a4\u30f3\u304c\u671f\u9650\u5207\u308c\u306b\u306a\u308b\u3068\u3001\u305d\u306e\u30c9\u30e1\u30a4\u30f3\u3092\u6307\u3059\u3059\u3079\u3066\u306e\u30c9\u30e1\u30a4\u30f3\u304c\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u306b\u306a\u3063\u3066\u3057\u307e\u3046\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u56f310\u306b\u305d\u3046\u3057\u305fDNS\u30ec\u30b3\u30fc\u30c9\u306e\u4f8b\u3092\u6319\u3052\u307e\u3059\u3002<\/p>\n<figure id=\"attachment_120554\" aria-describedby=\"caption-attachment-120554\" style=\"width: 824px\" class=\"wp-caption aligncenter\"><img  class=\"wp-image-120555 lozad\"  data-src=\"https:\/\/unit42.paloaltonetworks.com\/wp-content\/uploads\/2021\/09\/word-image-46.png\" alt=\"\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u30b5\u30fc\u30d3\u30b9\u306f\u3001\u5ec3\u6b62\u3055\u308c\u308b\u3053\u3068\u3082\u3042\u308c\u3070\u30b5\u30fc\u30d3\u30b9\u63d0\u4f9b\u7528\u306e\u30c9\u30e1\u30a4\u30f3\u304c\u65b0\u3057\u3044\u3082\u306e\u306b\u79fb\u884c\u3059\u308b\u3053\u3068\u3082\u3042\u308b\u3002\u3053\u306e\u4f8b\u306f\u3001\u305d\u3046\u3057\u305f\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u30b5\u30fc\u30d3\u30b9\u3092\u6307\u3057\u3066\u3044\u308b\u5834\u5408\u306b\u30c9\u30e1\u30a4\u30f3\u304c\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u3057\u3066\u3057\u307e\u3046\u5834\u5408\u304c\u3042\u308b\u3053\u3068\u3092\u793a\u3057\u3066\u3044\u308b\" width=\"824\" height=\"54\" \/><figcaption id=\"caption-attachment-120554\" class=\"wp-caption-text\">\u56f310 \u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u30b5\u30fc\u30d3\u30b9\u306f\u3001\u5ec3\u6b62\u3055\u308c\u308b\u3053\u3068\u3082\u3042\u308c\u3070\u30b5\u30fc\u30d3\u30b9\u63d0\u4f9b\u7528\u306e\u30c9\u30e1\u30a4\u30f3\u304c\u65b0\u3057\u3044\u3082\u306e\u306b\u79fb\u884c\u3059\u308b\u3053\u3068\u3082\u3042\u308b\u3002\u3053\u306e\u4f8b\u306f\u3001\u305d\u3046\u3057\u305f\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u30b5\u30fc\u30d3\u30b9\u3092\u6307\u3057\u3066\u3044\u308b\u5834\u5408\u306b\u30c9\u30e1\u30a4\u30f3\u304c\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u3057\u3066\u3057\u307e\u3046\u5834\u5408\u304c\u3042\u308b\u3053\u3068\u3092\u793a\u3057\u3066\u3044\u308b<\/figcaption><\/figure>\n<p>\u30aa\u30f3\u30e9\u30a4\u30f3\u3067\u516c\u958b\u3055\u308c\u3066\u3044\u308b<a href=\"https:\/\/www.slideshare.net\/ivinco\/website-search\">\u30b9\u30e9\u30a4\u30c9<\/a>\u306b\u3088\u308b\u3068\u3001<span style=\"font-family: 'courier new', courier, monospace;\">getwebsitesearch[.]com<\/span>\u306f\u3001Web\u30b5\u30a4\u30c8\u306b\u30ab\u30b9\u30bf\u30e0\u691c\u7d22\u30a8\u30f3\u30b8\u30f3\u3092\u63d0\u4f9b\u3059\u308b\u30b9\u30bf\u30fc\u30c8\u30a2\u30c3\u30d7\u306b\u6240\u6709\u3055\u308c\u3066\u3044\u307e\u3057\u305f\u3002\u3057\u304b\u3057\u540c\u793e\u304c\u30b5\u30fc\u30d3\u30b9\u3092\u7d42\u4e86\u3057\u305f\u305f\u3081\u30c9\u30e1\u30a4\u30f3\u306e\u6709\u52b9\u671f\u9650\u304c\u5207\u308c\u3066\u3057\u307e\u3044\u307e\u3057\u305f\u3002<\/p>\n<h3><strong>\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30ef\u30a4\u30eb\u30c9\u30ab\u30fc\u30c9 DNS \u30ec\u30b3\u30fc\u30c9<\/strong><\/h3>\n<p>\u307b\u3068\u3093\u3069\u306e\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0DNS\u30ec\u30b3\u30fc\u30c9\u306f\u30011\u3064\u306e\u30c9\u30e1\u30a4\u30f3\u306b\u3057\u304b\u5f71\u97ff\u3057\u307e\u305b\u3093\u3002\u3057\u304b\u3057\u3001\u30d1\u30c3\u30b7\u30d6DNS\u3067\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u72b6\u614b\u306b\u3042\u308b\u30ef\u30a4\u30eb\u30c9\u30ab\u30fc\u30c9DNS\u30ec\u30b3\u30fc\u30c9\u304c88\u500b\u3082\u898b\u3064\u304b\u308a\u307e\u3057\u305f\u3002\u3053\u306e\u3088\u3046\u306a\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30ec\u30b3\u30fc\u30c9\u306f\u3001\u95a2\u9023\u3059\u308brrname\u306e\u4e0b\u306b\u3042\u308b\u3059\u3079\u3066\u306e\u5b58\u5728\u3057\u306a\u3044\u30c9\u30e1\u30a4\u30f3\u304c\u653b\u6483\u8005\u306b\u30cf\u30a4\u30b8\u30e3\u30c3\u30af\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3068\u3044\u3046\u70b9\u3067\u975e\u5e38\u306b\u8208\u5473\u6df1\u3044\u3082\u306e\u3067\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u56f311\u306b\u793a\u3059\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30ec\u30b3\u30fc\u30c9\u304c\u5b58\u5728\u3059\u308b\u3053\u3068\u3067\u3001<span style=\"font-family: 'courier new', courier, monospace;\">ch[xxxxxx]wer[.]com<\/span>\u306e\u30be\u30fc\u30f3\u30d5\u30a1\u30a4\u30eb\u306b\u660e\u793a\u7684\u306b\u6307\u5b9a\u3055\u308c\u3066\u3044\u306a\u3044\u3059\u3079\u3066\u306e\u30c9\u30e1\u30a4\u30f3\u304c\u30cf\u30a4\u30b8\u30e3\u30c3\u30af\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3068\u304f\u306b\u3001\u653b\u6483\u8005\u306f\u3001\u30d5\u30a3\u30c3\u30b7\u30f3\u30b0\u30b3\u30f3\u30c6\u30f3\u30c4\u306e\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u3084\u30b3\u30de\u30f3\u30c9\uff06\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u3068\u3057\u3066\u306e\u6a5f\u80fd\u306a\u3069\u3001\u60aa\u610f\u306e\u3042\u308b\u76ee\u7684\u306e\u305f\u3081\u306b\u3001\u7121\u9650\u306e\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u3092\u751f\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3055\u3089\u306b\u60aa\u3044\u3053\u3068\u306b\u3001\u30ef\u30a4\u30eb\u30c9\u30ab\u30fc\u30c9DNS\u30ec\u30b3\u30fc\u30c9\u304c\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u3057\u3066\u3044\u308b\u3068\u3001\u9632\u5fa1\u5074\u306f\u30cf\u30a4\u30b8\u30e3\u30c3\u30af\u3055\u308c\u305f\u30c9\u30e1\u30a4\u30f3\u3092\u30d6\u30ed\u30c3\u30af\u3059\u308b\u3053\u3068\u304c\u3055\u3089\u306b\u96e3\u3057\u304f\u306a\u308a\u307e\u3059\u3002\u552f\u4e00\u78ba\u5b9f\u306a\u9632\u5fa1\u7b56\u306f\u3001\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30ec\u30b3\u30fc\u30c9\u3092\u524a\u9664\u3059\u308b\u304b\u3001\u30ef\u30a4\u30eb\u30c9\u30ab\u30fc\u30c9\u30c9\u30e1\u30a4\u30f3\u3092\u9632\u5fa1\u7684\u306b\u30c6\u30a4\u30af\u30aa\u30fc\u30d0\u30fc\u3059\u308b\u3053\u3068\u3067\u3059\u3002<\/p>\n<figure id=\"attachment_120556\" aria-describedby=\"caption-attachment-120556\" style=\"width: 862px\" class=\"wp-caption aligncenter\"><img  class=\"wp-image-120557 lozad\"  data-src=\"https:\/\/unit42.paloaltonetworks.com\/wp-content\/uploads\/2021\/09\/word-image-47.png\" alt=\"\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30ef\u30a4\u30eb\u30c9\u30ab\u30fc\u30c9DNS\u30ec\u30b3\u30fc\u30c9\u306e\u4f8b\" width=\"862\" height=\"58\" \/><figcaption id=\"caption-attachment-120556\" class=\"wp-caption-text\">\u56f311 \u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30ef\u30a4\u30eb\u30c9\u30ab\u30fc\u30c9DNS\u30ec\u30b3\u30fc\u30c9\u306e\u4f8b<\/figcaption><\/figure>\n<h3><strong>\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0NS\u30ec\u30b3\u30fc\u30c9<\/strong><\/h3>\n<p>\u524d\u8ff0\u3057\u305f\u3088\u3046\u306b\u3001NS\u30ec\u30b3\u30fc\u30c9\u304c\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u72b6\u614b\u306b\u306a\u3063\u3066\u3044\u308b\u3068\u305d\u306e\u30ec\u30b3\u30fc\u30c9\u306b\u59d4\u4efb\u3055\u308c\u305f\u3059\u3079\u3066\u306e\u30c9\u30e1\u30a4\u30f3\u304c\u30cf\u30a4\u30b8\u30e3\u30c3\u30af\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u3053\u3067\u3001\u4eca\u56de\u306e\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u3067\u3069\u308c\u3060\u3051\u306e\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u304c\u691c\u51fa\u3055\u308c\u308b\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3057\u305f\u3002\u5408\u8a08\u3059\u308b\u3068\u30011,659\u500b\u306e\u4e00\u610f\u306a\u30eb\u30fc\u30c8\u30c9\u30e1\u30a4\u30f3\u4e0b\u306b1,974\u500b\u306e\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0NS\u30ec\u30b3\u30fc\u30c9\u304c\u898b\u3064\u304b\u308a\u307e\u3057\u305f\u3002\u306a\u304a\u3001\u3053\u3053\u3067\u306frrname\u3068rdata\u306e\u30eb\u30fc\u30c8\u30c9\u30e1\u30a4\u30f3\u304c\u540c\u3058\u3067\u3042\u308bDNS\u30ec\u30b3\u30fc\u30c9\u306f\u9664\u5916\u3057\u3066\u3044\u307e\u3059\u3002\u307e\u305f\u3001rrname\u306e\u6709\u52b9\u671f\u9650\u304c\u5207\u308c\u3066\u3044\u308bDNS\u30ec\u30b3\u30fc\u30c9\u3082\u9664\u5916\u3057\u307e\u3057\u305f\u3002\u8208\u5473\u6df1\u3044\u3053\u3068\u306b\u3001\u591a\u304f\u306errname\u304c\u3042\u308b1\u3064\u306e\u671f\u9650\u5207\u308c\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc\u30c9\u30e1\u30a4\u30f3\u306b\u59d4\u4efb\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3057\u305f\u3002\u305f\u3068\u3048\u3070\u3001\u30eb\u30fc\u30c8\u30c9\u30e1\u30a4\u30f3\u304c\u7570\u306a\u308b15\u500b\u306e\u30e6\u30cb\u30fc\u30af\u306arrname\u304c\u3001\u540c\u3058\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc<span style=\"font-family: 'courier new', courier, monospace;\">ns.a.cloudtabo[.]com<\/span>\u3068<span style=\"font-family: 'courier new', courier, monospace;\">ns.b.cloudtabo[.]com<\/span>\u306b\u59d4\u4efb\u3055\u308c\u3066\u3044\u307e\u3057\u305f\u3002\u3053\u306e\u7d50\u679c\u3001\u653b\u6483\u8005\u306f1\u3064\u306e\u30c9\u30e1\u30a4\u30f3\u3092\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u3059\u308b\u3060\u3051\u3067\u3001\u4ed6\u306e15\u500b\u306e\u30c9\u30e1\u30a4\u30f3\u3092\u30cf\u30a4\u30b8\u30e3\u30c3\u30af\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002\u3053\u308c\u3089\u306e15\u306e\u540d\u524d\u3092\u624b\u52d5\u3067\u78ba\u8a8d\u3057\u305f\u3068\u3053\u308d\u3001\u3053\u308c\u3089\u306e\u540d\u524d\u306f\u3059\u3079\u3066\u3001\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc<span style=\"font-family: 'courier new', courier, monospace;\">ns.c.clouddra[.]com<\/span>\u304a\u3088\u3073<span style=\"font-family: 'courier new', courier, monospace;\">ns.d.clouddra[.]com<\/span>\u3092\u6307\u3059\u5197\u9577\u306aNS\u30ec\u30b3\u30fc\u30c9\u3092\u6301\u3063\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3057\u305f\u3002<span style=\"font-family: 'courier new', courier, monospace;\">clouddra[.]com<\/span>\u306f\u307e\u3060\u6709\u52b9\u306a\u306e\u3067\u3001\u5f71\u97ff\u3092\u53d7\u3051\u308b15\u500b\u306e\u30c9\u30e1\u30a4\u30f3\u306f\u307e\u3060\u6b63\u5e38\u306b\u52d5\u4f5c\u3057\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u653b\u6483\u8005\u306f\u3053\u308c\u3089\u306e15\u306e\u30c9\u30e1\u30a4\u30f3\u3078\u306e\u90e8\u5206\u7684\u306a\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u3092\u30cf\u30a4\u30b8\u30e3\u30c3\u30af\u3057\u3001\u30b5\u30fc\u30d3\u30b9\u59a8\u5bb3\u3084NS\u30d4\u30f3\u30cb\u30f3\u30b0\u306e\u6280\u8853\u3092\u5229\u7528\u3057\u3066\u5b8c\u5168\u306b\u5236\u5fa1\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<h2>\u7d50\u8ad6<\/h2>\n<p>\u672c\u7a3f\u3067\u306f\u3001\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0DNS\u30ec\u30b3\u30fc\u30c9\u306e\u6982\u5ff5\u3092\u7d39\u4ecb\u3057\u3001\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u304c\u3044\u307e\u3060\u306b\u8513\u5ef6\u3057\u3066\u304a\u308a\u3001\u6df1\u523b\u306a\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u4e0a\u306e\u8105\u5a01\u3068\u306a\u308a\u5f97\u308b\u3053\u3068\u3092\u793a\u3057\u307e\u3057\u305f\u3002\u3068\u304f\u306b\u3001\u767a\u898b\u3055\u308c\u305f31\u4e077000\u4ef6\u306e\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u306e\u4e2d\u306b\u306f<span style=\"font-family: 'courier new', courier, monospace;\">edu<\/span>\u3084<span style=\"font-family: 'courier new', courier, monospace;\">gov<\/span>\u3001<a href=\"https:\/\/tranco-list.eu\/\">Tranco \u30c8\u30c3\u30d7\u306e\u30c9\u30e1\u30a4\u30f3<\/a>\u306a\u3069\u3001\u8457\u540d\u306aDNS\u30be\u30fc\u30f3\u306e\u6570\u5343\u4ef6\u306e\u30c9\u30e1\u30a4\u30f3\u3082\u542b\u307e\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u30d1\u30ed\u30a2\u30eb\u30c8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30b9\u3067\u306f\u3001\u691c\u51fa\u3055\u308c\u305f\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u3092\u3001<a href=\"https:\/\/www.paloaltonetworks.jp\/network-security\/security-subscriptions\">\u6b21\u4e16\u4ee3\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30b5\u30d6\u30b9\u30af\u30ea\u30d7\u30b7\u30e7\u30f3<\/a>\u3067\u3042\u308b\u300c<a href=\"https:\/\/www.paloaltonetworks.jp\/products\/threat-detection-and-prevention\/dns-security\">DNS\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3<\/a>\u300d\u3084\u300c<a href=\"https:\/\/docs.paloaltonetworks.com\/pan-os\/10-1\/pan-os-new-features\/url-filtering-features\/advanced-url-filtering.html\">Advanced URL Filtering<\/a>\u300d\u306a\u3069\u3092\u901a\u3058\u3066\u3001\u30b0\u30ec\u30a4\u30a6\u30a7\u30a2\u306e\u30ab\u30c6\u30b4\u30ea\u3067\u3042\u308b\u3068\u3057\u3066\u3044\u307e\u3059\u3002\u5f0a\u793e\u306e\u304a\u5ba2\u69d8\u306f\u4e0a\u8a18\u3067\u8a00\u53ca\u3057\u305f\u30c9\u30e1\u30a4\u30f3\u304b\u3089\u306e\u88ab\u5bb3\u3060\u3051\u3067\u306a\u304f\u3001\u5f53\u8a72\u30b7\u30b9\u30c6\u30e0\u3067\u6355\u6349\u3057\u305f\u307b\u304b\u306e\u30ea\u30b9\u30af\u306e\u9ad8\u3044\u30c9\u30e1\u30a4\u30f3\u304b\u3089\u3082\u4fdd\u8b77\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u30d1\u30ed\u30a2\u30eb\u30c8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30b9\u306f\u691c\u51fa\u3055\u308c\u305f\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u306e\u6240\u6709\u8005\u306b\u306f\u901a\u77e5\u6e08\u307f\u3067\u3059\u3002\u672c\u7a3f\u3067\u7d39\u4ecb\u3057\u305f\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u30c9\u30e1\u30a4\u30f3\u306f\u9632\u5fa1\u306e\u305f\u3081\u306b\u30c6\u30a4\u30af\u30aa\u30fc\u30d0\u30fc\u3055\u308c\u3066\u304a\u308a\u3001\u60aa\u8cea\u306a\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u63d0\u4f9b\u3059\u308b\u3053\u3068\u306f\u306a\u304f\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2>\u8ffd\u52a0\u8cc7\u6599<\/h2>\n<ul>\n<li><a href=\"https:\/\/unit42.paloaltonetworks.jp\/dns-rebinding\/\">DNS\u30ea\u30d0\u30a4\u30f3\u30c7\u30a3\u30f3\u30b0\u653b\u6483: \u60aa\u610f\u306e\u3042\u308bWeb\u30b5\u30a4\u30c8\u304c\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3092\u60aa\u7528\u3059\u308b\u65b9\u6cd5<\/a><\/li>\n<li><a href=\"https:\/\/unit42.paloaltonetworks.jp\/proactive-detector\/\">DNS\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3067\u60aa\u610f\u306e\u3042\u308b\u30c9\u30e1\u30a4\u30f3\u3092\u30d7\u30ed\u30a2\u30af\u30c6\u30a3\u30d6\u306b\u691c\u51fa\u30fb\u9632\u6b62\u3059\u308b<\/a><\/li>\n<li><a href=\"https:\/\/unit42.paloaltonetworks.jp\/fast-flux-101\/\">\u9ad8\u901f\u30d5\u30e9\u30c3\u30af\u30b9\u5165\u9580: 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