{"id":11689,"date":"2025-11-18T13:44:40","date_gmt":"2025-11-18T04:44:40","guid":{"rendered":"https:\/\/rakkoserver.com\/plus\/?p=11689"},"modified":"2026-01-30T11:26:45","modified_gmt":"2026-01-30T02:26:45","slug":"tool-ptr-lookup","status":"publish","type":"post","link":"https:\/\/rakkoserver.com\/plus\/tool-ptr-lookup\/","title":{"rendered":"PTR\u30ec\u30b3\u30fc\u30c9\u78ba\u8a8d\u30c4\u30fc\u30eb"},"content":{"rendered":"\n<div id=\"ptr-record-tool\">\n  <style>\n    #ptr-record-tool {\n      border: none;\n      padding: 0;\n      margin: 0;\n      font-family: -apple-system, BlinkMacSystemFont, \"Segoe UI\", sans-serif;\n      color: #111;\n    }\n    #ptr-record-tool * {\n      box-sizing: border-box;\n    }\n\n    #ptr-record-tool .ptr-inner {\n      max-width: 700px;\n    }\n\n    \/* Form rows *\/\n    #ptr-record-tool .ptr-form-row {\n      display: flex;\n      flex-direction: column;\n      margin-bottom: 12px;\n    }\n    #ptr-record-tool .ptr-label {\n      font-size: 13px;\n      margin-bottom: 4px;\n    }\n    #ptr-record-tool .ptr-required {\n      color: #c00;\n      font-size: 11px;\n      margin-left: 4px;\n    }\n\n    #ptr-record-tool input[type=\"text\"] {\n      width: 100%;\n      font-size: 14px;\n      padding: 8px 10px;\n      border-radius: 4px;\n      border: 1px solid #ccc;\n      outline: none;\n    }\n    #ptr-record-tool input[type=\"text\"]:focus {\n      border-color: #007cba;\n      box-shadow: 0 0 0 1px #007cba1a;\n    }\n\n    #ptr-record-tool .ptr-input-hint {\n      font-size: 11px;\n      color: #777;\n      margin-top: 3px;\n    }\n\n    \/* Actions *\/\n    #ptr-record-tool .ptr-actions {\n      margin-top: 8px;\n      display: flex;\n      align-items: center;\n      gap: 8px;\n    }\n    #ptr-record-tool button.ptr-submit {\n      appearance: none;\n      border: none;\n      cursor: pointer;\n      font-size: 14px;\n      font-weight: 500;\n      padding: 8px 18px;\n      border-radius: 4px;\n      background-color: #007cba;\n      color: #fff;\n      white-space: nowrap;\n    }\n    #ptr-record-tool button.ptr-submit:disabled {\n      opacity: 0.6;\n      cursor: default;\n    }\n\n    #ptr-record-tool .ptr-loading {\n      font-size: 13px;\n      color: #555;\n    }\n\n    \/* Message *\/\n    #ptr-record-tool .ptr-message {\n      margin-top: 10px;\n      font-size: 13px;\n    }\n    #ptr-record-tool .ptr-message-error {\n      color: #b00020;\n    }\n    #ptr-record-tool .ptr-message-success {\n      color: #111;\n    }\n\n    \/* Result *\/\n    #ptr-record-tool .ptr-result {\n      margin-top: 16px;\n      border-radius: 6px;\n      background-color: #fafafa;\n      padding: 12px 12px 10px 12px;\n      display: none;\n    }\n\n    #ptr-record-tool .ptr-result-summary {\n      font-size: 15px;\n      font-weight: 600;\n      margin: 0 0 6px 0;\n    }\n\n    #ptr-record-tool .ptr-meta {\n      font-size: 12px;\n      color: #555;\n      margin: 0 0 4px 0;\n    }\n\n    #ptr-record-tool .ptr-section-title {\n      font-size: 13px;\n      font-weight: 600;\n      margin: 10px 0 4px 0;\n    }\n\n    #ptr-record-tool .ptr-list {\n      font-size: 12px;\n      margin: 0;\n      padding-left: 16px;\n    }\n\n    #ptr-record-tool .ptr-list li {\n      margin-bottom: 2px;\n    }\n\n    \/* CTA Wrapper *\/\n    #ptr-record-tool .ptr-cta-wrapper {\n      display: none !important;\n      margin-left: 8px !important;\n      vertical-align: middle !important;\n    }\n    #ptr-record-tool .ptr-cta-wrapper.ptr-cta-wrapper--show {\n      display: inline-block !important;\n    }\n\n    \/* CTA Label (Orange badge) *\/\n    #ptr-record-tool .ptr-cta-label {\n      display: inline-block !important;\n      padding: 1px 4px !important;\n      background: #ff6b35 !important;\n      color: #fff !important;\n      font-size: 9px !important;\n      font-weight: 600 !important;\n      border-radius: 2px !important;\n      white-space: nowrap !important;\n      margin-right: 6px !important;\n      vertical-align: middle !important;\n    }\n\n    \/* CTA Button (small inline, black) *\/\n    #ptr-record-tool .ptr-cta-btn {\n      display: inline-block !important;\n      padding: 4px 10px !important;\n      background: #333 !important;\n      color: #fff !important;\n      font-size: 11px !important;\n      font-weight: 500 !important;\n      text-decoration: none !important;\n      border-radius: 3px !important;\n      white-space: nowrap !important;\n      transition: all 0.2s ease !important;\n    }\n\n    #ptr-record-tool .ptr-cta-btn:hover {\n      background: #555 !important;\n    }\n\n    #ptr-record-tool .ptr-cta-domain {\n      font-weight: 700 !important;\n    }\n\n    \/* Responsive *\/\n    @media (max-width: 480px) {\n      #ptr-record-tool .ptr-cta-wrapper {\n        display: block !important;\n        margin-left: 0 !important;\n        margin-top: 6px !important;\n      }\n      #ptr-record-tool .ptr-cta-wrapper.ptr-cta-wrapper--show {\n        display: block !important;\n      }\n      #ptr-record-tool .ptr-cta-btn {\n        white-space: normal !important;\n        max-width: 100% !important;\n        word-break: break-word !important;\n        display: inline-block !important;\n      }\n      #ptr-record-tool .ptr-cta-label {\n        display: inline-block !important;\n      }\n    }\n\n    \/* Table *\/\n    #ptr-record-tool table.ptr-table {\n      width: 100%;\n      border-collapse: collapse;\n      font-size: 12px;\n    }\n    #ptr-record-tool .ptr-table th,\n    #ptr-record-tool .ptr-table td {\n      text-align: left;\n      padding: 4px 4px;\n      border-bottom: 1px solid #e0e0e0;\n      vertical-align: top;\n    }\n    #ptr-record-tool .ptr-table th {\n      font-weight: 600;\n      color: #333;\n    }\n\n    #ptr-record-tool .ptr-match-ok {\n      font-weight: 600;\n    }\n    #ptr-record-tool .ptr-match-ng {\n      font-weight: 600;\n    }\n\n    #ptr-record-tool .ptr-note {\n      font-size: 12px;\n      color: #666;\n      margin-top: 6px;\n    }\n\n    @media (max-width: 480px) {\n      #ptr-record-tool .ptr-inner {\n        max-width: 100%;\n      }\n\n      #ptr-record-tool .ptr-actions {\n        flex-direction: column;\n        align-items: flex-start;\n      }\n\n      #ptr-record-tool button.ptr-submit {\n        width: 100%;\n        text-align: center;\n      }\n    }\n  <\/style>\n\n  <div class=\"ptr-inner\">\n    <form id=\"ptr-record-form\" autocomplete=\"off\">\n      <div class=\"ptr-form-row\">\n        <label class=\"ptr-label\">\n          IP\u30a2\u30c9\u30ec\u30b9\n          <span class=\"ptr-required\">\u5fc5\u9808<\/span>\n        <\/label>\n        <input id=\"ptr-ip\" type=\"text\" inputmode=\"numeric\" placeholder=\"\u4f8b\uff098.8.8.8\" required>\n        <p class=\"ptr-input-hint\">\n          IPv4 \u307e\u305f\u306f IPv6 \u3092\u5165\u529b\u3057\u3066\u304f\u3060\u3055\u3044(\u4f8b:8.8.8.8 \/ 2001:4860:4860::8888)\u3002\n        <\/p>\n      <\/div>\n\n      <div class=\"ptr-form-row\">\n        <label class=\"ptr-label\">\n          DNS\u30b5\u30fc\u30d0\u30fc\n        <\/label>\n        <input id=\"ptr-dns\" type=\"text\" inputmode=\"numeric\" placeholder=\"8.8.8.8\" value=\"8.8.8.8\">\n        <p class=\"ptr-input-hint\">\n          \u9006\u5f15\u304d\u30fb\u6b63\u5f15\u304d\u306b\u5229\u7528\u3059\u308bDNS\u30b5\u30fc\u30d0\u30fc\u3092 IPv4\u30a2\u30c9\u30ec\u30b9\u3067\u6307\u5b9a\u3057\u307e\u3059\u3002\u672a\u5165\u529b\u306e\u5834\u5408\u306f\u300c8.8.8.8\u300d\u304c\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\n        <\/p>\n      <\/div>\n\n      <div class=\"ptr-actions\">\n        <button type=\"submit\" class=\"ptr-submit\" id=\"ptr-submit-btn\">\n          \u78ba\u8a8d\u3059\u308b\n        <\/button>\n        <p class=\"ptr-loading\" id=\"ptr-loading\" style=\"display:none;\">\n          \u691c\u7d22\u4e2d\u3067\u3059\u2026\n        <\/p>\n      <\/div>\n\n      <p class=\"ptr-message\" id=\"ptr-message\"><\/p>\n    <\/form>\n\n    <div class=\"ptr-result\" id=\"ptr-result\" aria-live=\"polite\">\n      <p class=\"ptr-result-summary\" id=\"ptr-result-summary\"><\/p>\n      <p class=\"ptr-meta\" id=\"ptr-meta-ip\"><\/p>\n      <p class=\"ptr-meta\" id=\"ptr-meta-dns\"><\/p>\n\n      <p class=\"ptr-section-title\">\u9006\u5f15\u304d\u7d50\u679c(PTR\u30ec\u30b3\u30fc\u30c9)<\/p>\n      <ul class=\"ptr-list\" id=\"ptr-list\"><\/ul>\n\n      <p class=\"ptr-section-title\">\u6b63\u5f15\u304d\u78ba\u8a8d\u7d50\u679c<\/p>\n      <table class=\"ptr-table\">\n        <thead>\n          <tr>\n            <th>\u30c9\u30e1\u30a4\u30f3\u540d<\/th>\n            <th>\u30ec\u30b3\u30fc\u30c9\u30bf\u30a4\u30d7<\/th>\n            <th>\u53d6\u5f97\u3057\u305fIP\u30a2\u30c9\u30ec\u30b9<\/th>\n            <th>\u4e00\u81f4\u72b6\u614b<\/th>\n          <\/tr>\n        <\/thead>\n        <tbody id=\"ptr-forward-body\"><\/tbody>\n      <\/table>\n\n      <p class=\"ptr-note\" id=\"ptr-note\"><\/p>\n    <\/div>\n  <\/div>\n<\/div>\n\n\n\n<!-- \u5171\u901aCSS\uff081\u56de\u3060\u3051\u8aad\u307f\u8fbc\u3081\u3070OK\uff09 -->\n<style>\n  .rs-related-tools {\n    background: transparent;\n    color: #000;\n    padding: 10px 0;\n    font-size: 14px;\n    line-height: 1.6;\n    display: flex;\n    flex-wrap: wrap;\n    gap: 8px 12px;\n    align-items: center;\n    margin: 16px 0;\n  }\n  .rs-related-tools__label {\n    border: 1px solid #000;\n    padding: 2px 6px;\n    border-radius: 4px;\n    font-weight: 600;\n    white-space: nowrap;\n  }\n  .rs-related-tools a {\n    color: #0066cc; \/* \u6a19\u6e96\u30ea\u30f3\u30af\u8272 *\/\n    text-decoration: none;\n    white-space: nowrap;\n  }\n  .rs-related-tools a:hover,\n  .rs-related-tools a:focus {\n    text-decoration: underline;\n  }\n<\/style>\n<div class=\"rs-related-tools\">\n  <span class=\"rs-related-tools__label\">\u95a2\u9023\u30c4\u30fc\u30eb<\/span>\n  <a href=\"https:\/\/rakkoserver.com\/plus\/tool-nslookup-dig\/\">nslookup \/ dig<\/a>\n  <a href=\"https:\/\/rakkoserver.com\/plus\/tool-a-record-check\/\">A<\/a>\n  <a href=\"https:\/\/rakkoserver.com\/plus\/tool-mx-checker\/\">MX<\/a>\n  <a href=\"https:\/\/rakkoserver.com\/plus\/tool-spf-checker\/\">SPF<\/a>\n  <a href=\"http:\/\/rakkoserver.com\/plus\/tool-dmarc-check\/\">DMARC<\/a>\n<\/div>\n\n\n\n<p>\u3053\u306e\u300cPTR\u30ec\u30b3\u30fc\u30c9\u78ba\u8a8d\u30c4\u30fc\u30eb\u300d\u306f\u3001\u6307\u5b9a\u3055\u308c\u305fIP\u30a2\u30c9\u30ec\u30b9\uff08IPv4\u307e\u305f\u306fIPv6\uff09\u306ePTR\u30ec\u30b3\u30fc\u30c9\uff08\u9006\u5f15\u304dDNS\uff09\u3092\u7c21\u5358\u306b\u78ba\u8a8d\u3067\u304d\u308b\u7121\u6599\u30c4\u30fc\u30eb\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-0\">\u3053\u306e\u30c4\u30fc\u30eb\u3067\u3067\u304d\u308b\u3053\u3068<\/h2>\n\n\n\n<p>IP\u30a2\u30c9\u30ec\u30b9\u304b\u3089\u3001\u305d\u306eIP\u30a2\u30c9\u30ec\u30b9\u306b\u7d10\u3065\u3051\u3089\u308c\u305f\u30c9\u30e1\u30a4\u30f3\u540d\uff08\u30db\u30b9\u30c8\u540d\uff09\u3092\u8abf\u3079\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u30c4\u30fc\u30eb\u306f\u4ee5\u4e0b\u306e2\u3064\u306e\u7279\u5fb4\u7684\u306a\u6a5f\u80fd\u3092\u6301\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>PTR\u30ec\u30b3\u30fc\u30c9\u306e\u53d6\u5f97:<\/strong> \u5165\u529b\u3055\u308c\u305fIP\u30a2\u30c9\u30ec\u30b9\u306e\u9006\u5f15\u304dDNS\u60c5\u5831\u3092\u691c\u7d22\u3057\u3001\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u308b\u30c9\u30e1\u30a4\u30f3\u540d\u3092\u8868\u793a\u3057\u307e\u3059\u3002<\/li>\n\n\n\n<li><strong>\u6b63\u5f15\u304d\u30fb\u9006\u5f15\u304d\u306e\u4e00\u81f4\u78ba\u8a8d (FCrDNS):<\/strong> \u9006\u5f15\u304d\u3067\u53d6\u5f97\u3057\u305f\u30c9\u30e1\u30a4\u30f3\u540d\u3092\u4f7f\u3044\u3001\u4eca\u5ea6\u306f\u300c\u6b63\u5f15\u304d\u300d\uff08\u30c9\u30e1\u30a4\u30f3\u540d\u304b\u3089IP\u30a2\u30c9\u30ec\u30b9\u3092\u5f15\u304f\uff09\u3092\u884c\u3044\u307e\u3059\u3002\u305d\u306e\u7d50\u679c\u3001\u5165\u529b\u3057\u305fIP\u30a2\u30c9\u30ec\u30b9\u3068\u6b63\u5f15\u304d\u3057\u305fIP\u30a2\u30c9\u30ec\u30b9\u304c\u4e00\u81f4\u3059\u308b\u304b\u3069\u3046\u304b\u3092\u81ea\u52d5\u3067\u5224\u5b9a\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u3053\u306e\u300c\u4e00\u81f4\u78ba\u8a8d\u300d\u306f\u3001\u7279\u306b\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u306e\u4fe1\u983c\u6027\u3092\u62c5\u4fdd\u3059\u308b\u305f\u3081\u306b\u975e\u5e38\u306b\u91cd\u8981\u306a\u8a2d\u5b9a\uff08FCrDNS\uff09\u304c\u6b63\u3057\u304f\u884c\u308f\u308c\u3066\u3044\u308b\u304b\u3092\u78ba\u8a8d\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\">\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-1\">\u30c4\u30fc\u30eb\u306e\u4f7f\u3044\u65b9<\/h2>\n\n\n\n<p>\u4f7f\u3044\u65b9\u306f\u975e\u5e38\u306b\u30b7\u30f3\u30d7\u30eb\u3067\u3059\u30023\u30b9\u30c6\u30c3\u30d7\u3067\u78ba\u8a8d\u304c\u5b8c\u4e86\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>IP\u30a2\u30c9\u30ec\u30b9\u306e\u5165\u529b (\u5fc5\u9808):<\/strong> \u78ba\u8a8d\u3057\u305f\u3044\u30b5\u30fc\u30d0\u30fc\u306eIP\u30a2\u30c9\u30ec\u30b9\uff08IPv4\u307e\u305f\u306fIPv6\uff09\u3092\u5165\u529b\u3057\u307e\u3059\u3002\n<ul class=\"wp-block-list\">\n<li>(\u4f8b: <code>8.8.8.8<\/code> \u307e\u305f\u306f <code>2001:4860:4860:8888<\/code>)<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>DNS\u30b5\u30fc\u30d0\u30fc\u306e\u6307\u5b9a (\u4efb\u610f):<\/strong> \u7279\u5b9a\u306eDNS\u30b5\u30fc\u30d0\u30fc\u3092\u4f7f\u3063\u3066\u78ba\u8a8d\u3057\u305f\u3044\u5834\u5408\u306f\u3001\u305d\u306eDNS\u30b5\u30fc\u30d0\u30fc\u306eIP\u30a2\u30c9\u30ec\u30b9\uff08IPv4\uff09\u3092\u5165\u529b\u3057\u307e\u3059\u3002\u7a7a\u6b04\u306e\u5834\u5408\u306f\u3001\u4fe1\u983c\u6027\u306e\u9ad8\u3044\u30d1\u30d6\u30ea\u30c3\u30afDNS\u300c<code>8.8.8.8<\/code>\u300d\u304c\u81ea\u52d5\u7684\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/li>\n\n\n\n<li><strong>\u78ba\u8a8d\u30dc\u30bf\u30f3\u306e\u30af\u30ea\u30c3\u30af:<\/strong> \u300c\u78ba\u8a8d\u3059\u308b\u300d\u30dc\u30bf\u30f3\u3092\u30af\u30ea\u30c3\u30af\u3059\u308b\u3068\u3001\u3059\u3050\u306b\u7d50\u679c\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\">\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-2\">\u3053\u306e\u30c4\u30fc\u30eb\u3067\u53d6\u5f97\u3059\u308b\u60c5\u5831\u306e\u57fa\u790e\u77e5\u8b58<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-3\">PTR\u30ec\u30b3\u30fc\u30c9\uff08\u9006\u5f15\u304dDNS\uff09\u3068\u306f\uff1f<\/h3>\n\n\n\n<p>PTR\u30ec\u30b3\u30fc\u30c9\uff08\u30d4\u30fc\u30c6\u30a3\u30fc\u30a2\u30fc\u30eb\u30ec\u30b3\u30fc\u30c9\uff09\u306f\u300cPointer Record\u300d\u306e\u7565\u3067\u3001DNS\uff08Domain Name System\uff09\u30ec\u30b3\u30fc\u30c9\u306e\u4e00\u7a2e\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u901a\u5e38\u306eDNS\uff08<strong>\u6b63\u5f15\u304d<\/strong>\uff09\u304c\u300c\u30c9\u30e1\u30a4\u30f3\u540d\uff08\u4f8b: <code>example.com<\/code>\uff09\u304b\u3089IP\u30a2\u30c9\u30ec\u30b9\uff08\u4f8b: <code>192.0.2.1<\/code>\uff09\u3092\u8abf\u3079\u308b\u300d\u306e\u306b\u5bfe\u3057\u3001PTR\u30ec\u30b3\u30fc\u30c9\u306f\u300cIP\u30a2\u30c9\u30ec\u30b9\u304b\u3089\u30c9\u30e1\u30a4\u30f3\u540d\u3092\u8abf\u3079\u308b\u300d\u305f\u3081\u306b\u4f7f\u308f\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u4ed5\u7d44\u307f\u3092**\u9006\u5f15\u304dDNS (Reverse DNS \/ rDNS)**\u3068\u547c\u3073\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-4\">A\u30ec\u30b3\u30fc\u30c9\u30fbAAAA\u30ec\u30b3\u30fc\u30c9\uff08\u6b63\u5f15\u304dDNS\uff09\u3068\u306f\uff1f<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>A\u30ec\u30b3\u30fc\u30c9:<\/strong> \u30c9\u30e1\u30a4\u30f3\u540d\u306b\u5bfe\u3057\u3066\u3001IPv4\u30a2\u30c9\u30ec\u30b9\u3092\u5272\u308a\u5f53\u3066\u308b\u30ec\u30b3\u30fc\u30c9\u3067\u3059\u3002<\/li>\n\n\n\n<li><strong>AAAA\u30ec\u30b3\u30fc\u30c9:<\/strong> \u30c9\u30e1\u30a4\u30f3\u540d\u306b\u5bfe\u3057\u3066\u3001IPv6\u30a2\u30c9\u30ec\u30b9\u3092\u5272\u308a\u5f53\u3066\u308b\u30ec\u30b3\u30fc\u30c9\u3067\u3059\u3002\uff08\u300c\u30af\u30a2\u30c3\u30c9\u30a8\u30fc\u300d\u3068\u8aad\u307f\u307e\u3059\uff09<\/li>\n<\/ul>\n\n\n\n<p>\u3053\u308c\u3089\u306f\u3001\u30d6\u30e9\u30a6\u30b6\u306e\u30a2\u30c9\u30ec\u30b9\u30d0\u30fc\u306b <code>example.com<\/code> \u3068\u5165\u529b\u3057\u305f\u969b\u306b\u3001\u3069\u306e\u30b5\u30fc\u30d0\u30fc\u306b\u30a2\u30af\u30bb\u30b9\u3057\u306b\u884c\u304f\u304b\u3092\u6c7a\u5b9a\u3059\u308b\u305f\u3081\u306e\u3001\u6700\u3082\u57fa\u672c\u7684\u306aDNS\u30ec\u30b3\u30fc\u30c9\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-5\">\u300c\u6b63\u5f15\u304d\u30fb\u9006\u5f15\u304d\u306e\u4e00\u81f4\u300d\u306e\u91cd\u8981\u6027<\/h3>\n\n\n\n<p>\u3053\u306e\u30c4\u30fc\u30eb\u3067\u306f\u300c\u6b63\u5f15\u304d\u78ba\u8a8d\u7d50\u679c\u300d\u3068\u3057\u3066\u3001\u300c\u4e00\u81f4\u72b6\u614b\u300d\u3092\u8868\u793a\u3057\u307e\u3059\u3002\u3053\u308c\u306f<strong>FCrDNS (Forward-confirmed reverse DNS)<\/strong> \u3068\u547c\u3070\u308c\u308b\u6280\u8853\u7684\u306a\u691c\u8a3c\u3067\u3059\u3002<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>FCrDNS (\u6b63\u5f15\u304d\u3067\u78ba\u8a8d\u3055\u308c\u305f\u9006\u5f15\u304dDNS) \u3068\u306f\uff1f<\/strong><\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>IP\u30a2\u30c9\u30ec\u30b9\u304b\u3089PTR\u30ec\u30b3\u30fc\u30c9\uff08\u30c9\u30e1\u30a4\u30f3\u540d\uff09\u3092\u5f15\u304f (\u9006\u5f15\u304d)<\/li>\n\n\n\n<li>\u305d\u306e\u30c9\u30e1\u30a4\u30f3\u540d\u304b\u3089A\/AAAA\u30ec\u30b3\u30fc\u30c9\uff08IP\u30a2\u30c9\u30ec\u30b9\uff09\u3092\u5f15\u304f (\u6b63\u5f15\u304d)<\/li>\n\n\n\n<li>1\u30682\u306e\u7d50\u679c\u304c\u4e00\u81f4\u3059\u308b\u3053\u3068\u3002<\/li>\n<\/ol>\n<\/blockquote>\n\n\n\n<p>\u591a\u304f\u306e\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\uff08\u7279\u306bGmail\u3084Microsoft 365\u306a\u3069\uff09\u306f\u3001\u8ff7\u60d1\u30e1\u30fc\u30eb\u5bfe\u7b56\u306e\u4e00\u74b0\u3068\u3057\u3066\u3001\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3057\u3066\u304d\u305f\u30b5\u30fc\u30d0\u30fc\u306eIP\u30a2\u30c9\u30ec\u30b9\u306b\u5bfe\u3057\u3066\u3053\u306eFCrDNS\u306e\u691c\u8a3c\u3092\u884c\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u3053\u3067\u300c\u4e0d\u4e00\u81f4\u300d\u3068\u306a\u3063\u305f\u308a\u3001PTR\u30ec\u30b3\u30fc\u30c9\u304c\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u306a\u304b\u3063\u305f\u308a\u3059\u308b\u3068\u3001\u300c\u306a\u308a\u3059\u307e\u3057\u306e\u53ef\u80fd\u6027\u304c\u3042\u308b\u602a\u3057\u3044\u30b5\u30fc\u30d0\u30fc\u300d\u3068\u5224\u65ad\u3055\u308c\u3001\u30e1\u30fc\u30eb\u304c\u53d7\u4fe1\u62d2\u5426\u3055\u308c\u305f\u308a\u3001\u8ff7\u60d1\u30e1\u30fc\u30eb\u30d5\u30a9\u30eb\u30c0\u306b\u632f\u308a\u5206\u3051\u3089\u308c\u305f\u308a\u3059\u308b\u78ba\u7387\u304c\u975e\u5e38\u306b\u9ad8\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\">\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-6\">\u3053\u306e\u30c4\u30fc\u30eb\u304c\u5f79\u7acb\u3064\u3068\u304d\u306f\u3069\u3093\u306a\u3068\u304d\uff1f\uff08\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\uff09<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-7\">1. \u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u306e\u8a2d\u5b9a\u78ba\u8a8d<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u76ee\u7684:<\/strong> \u30e1\u30fc\u30eb\u306e\u5230\u9054\u7387\u3092\u4e0a\u3052\u3001\u8ff7\u60d1\u30e1\u30fc\u30eb\u5224\u5b9a\u3092\u907f\u3051\u308b\u3002<\/li>\n\n\n\n<li><strong>\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9:<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u81ea\u793e\u3067\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u3092\u69cb\u7bc9\u30fb\u904b\u7528\u3057\u3066\u3044\u308b\u3002<\/li>\n\n\n\n<li>VPS\u3084\u30af\u30e9\u30a6\u30c9\uff08AWS, GCP, Azure\u306a\u3069\uff09\u3067\u30e1\u30fc\u30eb\u9001\u4fe1\u6a5f\u80fd\uff08\u4f8b: Web\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u304b\u3089\u306e\u901a\u77e5\u30e1\u30fc\u30eb\uff09\u3092\u5b9f\u88c5\u3057\u305f\u3002<\/li>\n\n\n\n<li>\u9001\u4fe1\u3057\u305f\u30e1\u30fc\u30eb\u304c\u76f8\u624b\u306b\u5c4a\u304b\u306a\u3044\u3001\u307e\u305f\u306f\u8ff7\u60d1\u30e1\u30fc\u30eb\u306b\u5165\u3063\u3066\u3057\u307e\u3046\u554f\u984c\u304c\u767a\u751f\u3057\u3066\u3044\u308b\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u78ba\u8a8d\u5185\u5bb9:<\/strong> \u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u306eIP\u30a2\u30c9\u30ec\u30b9\u3092\u5165\u529b\u3057\u3001PTR\u30ec\u30b3\u30fc\u30c9\u304c\u6b63\u3057\u304f\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u308b\u304b\u3001\u305d\u3057\u3066\u6b63\u5f15\u304d\u306e\u7d50\u679c\u3068\u300c\u4e00\u81f4\u300d\u3059\u308b\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-8\">2. \u30b5\u30fc\u30d0\u30fc\u30fb\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u78ba\u8a8d<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u76ee\u7684:<\/strong> \u30ed\u30b0\u306e\u5206\u6790\u3084\u30a2\u30af\u30bb\u30b9\u5143\u306e\u7279\u5b9a\u3002<\/li>\n\n\n\n<li><strong>\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9:<\/strong>\n<ul class=\"wp-block-list\">\n<li>Web\u30b5\u30fc\u30d0\u30fc\u306e\u30a2\u30af\u30bb\u30b9\u30ed\u30b0\u306b\u8a18\u9332\u3055\u308c\u305f\u4e0d\u5be9\u306aIP\u30a2\u30c9\u30ec\u30b9\u306e\u8eab\u5143\uff08\u30c9\u30e1\u30a4\u30f3\u540d\uff09\u3092\u8abf\u67fb\u3057\u305f\u3044\u3002<\/li>\n\n\n\n<li>\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u6a5f\u5668\u306e\u30ed\u30b0\u306b\u8868\u793a\u3055\u308c\u308bIP\u30a2\u30c9\u30ec\u30b9\u304c\u3001\u3069\u306e\u30db\u30b9\u30c8\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u304b\u3092\u78ba\u8a8d\u3057\u305f\u3044\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u78ba\u8a8d\u5185\u5bb9:<\/strong> \u30ed\u30b0\u306b\u8a18\u9332\u3055\u308c\u305fIP\u30a2\u30c9\u30ec\u30b9\u3092\u5165\u529b\u3057\u3001\u95a2\u9023\u3059\u308b\u30c9\u30e1\u30a4\u30f3\u540d\uff08\u7d44\u7e54\u540d\u3084\u30db\u30b9\u30c8\u540d\uff09\u304c\u8868\u793a\u3055\u308c\u308b\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-9\">3. IPv6\u8a2d\u5b9a\u306e\u78ba\u8a8d<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u76ee\u7684:<\/strong> IPv6\u74b0\u5883\u3067\u306e\u9006\u5f15\u304d\u8a2d\u5b9a\u306e\u691c\u8a3c\u3002<\/li>\n\n\n\n<li><strong>\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9:<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u30b5\u30fc\u30d0\u30fc\u3092IPv6\u306b\u5bfe\u5fdc\u3055\u305b\u305f\u304c\u3001\u9006\u5f15\u304d\u8a2d\u5b9a\u304c\u6b63\u3057\u304f\u3067\u304d\u3066\u3044\u308b\u304b\u4e0d\u5b89\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u78ba\u8a8d\u5185\u5bb9:<\/strong> IPv6\u30a2\u30c9\u30ec\u30b9\u3092\u5165\u529b\u3057\u3001\u6b63\u3057\u304fPTR\u30ec\u30b3\u30fc\u30c9\u304c\u8fd4\u3063\u3066\u304f\u308b\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002IPv6\u306e\u9006\u5f15\u304d\u306f\u8a2d\u5b9a\u304c\u8907\u96d1\u306a\u305f\u3081\u3001\u30c4\u30fc\u30eb\u3067\u306e\u78ba\u8a8d\u304c\u4fbf\u5229\u3067\u3059\u3002<\/li>\n<\/ul>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>IP\u30a2\u30c9\u30ec\u30b9 \u5fc5\u9808 IPv4 \u307e\u305f\u306f IPv6 \u3092\u5165\u529b\u3057\u3066\u304f\u3060\u3055\u3044(\u4f8b:8.8.8.8 \/ 2001:4860:4860::8888)\u3002 DNS\u30b5\u30fc\u30d0\u30fc \u9006\u5f15\u304d\u30fb\u6b63\u5f15\u304d\u306b\u5229\u7528\u3059\u308bDNS\u30b5\u30fc\u30d0\u30fc\u3092 IPv4\u30a2\u30c9\u30ec\u30b9\u3067\u6307\u5b9a\u3057 &#8230; <\/p>\n","protected":false},"author":4,"featured_media":11692,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23,26,8,27],"tags":[],"class_list":{"0":"post-11689","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-dns","8":"category-server","9":"category-tool","10":"category-mail","11":"entry"},"_links":{"self":[{"href":"https:\/\/rakkoserver.com\/plus\/wp-json\/wp\/v2\/posts\/11689","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rakkoserver.com\/plus\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rakkoserver.com\/plus\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rakkoserver.com\/plus\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/rakkoserver.com\/plus\/wp-json\/wp\/v2\/comments?post=11689"}],"version-history":[{"count":11,"href":"https:\/\/rakkoserver.com\/plus\/wp-json\/wp\/v2\/posts\/11689\/revisions"}],"predecessor-version":[{"id":12705,"href":"https:\/\/rakkoserver.com\/plus\/wp-json\/wp\/v2\/posts\/11689\/revisions\/12705"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/rakkoserver.com\/plus\/wp-json\/wp\/v2\/media\/11692"}],"wp:attachment":[{"href":"https:\/\/rakkoserver.com\/plus\/wp-json\/wp\/v2\/media?parent=11689"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rakkoserver.com\/plus\/wp-json\/wp\/v2\/categories?post=11689"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rakkoserver.com\/plus\/wp-json\/wp\/v2\/tags?post=11689"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}