{
  "name": "SiteKensa .jp ドメインのメール認証設定 実測データ",
  "description": "Majestic Million に掲載されている .jp ドメインについて、DNS に公開されている DMARC と DKIM の設定を実測した集計値。個々のドメイン名は含まない。",
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "creator": "SiteKensa (https://sitekensa.com)",
  "population": {
    "source": "Majestic Million",
    "sourceUrl": "https://majestic.com/reports/majestic-million",
    "sourceLicense": "CC BY 3.0",
    "filter": ".jp で終わるドメイン",
    "count": 19065,
    "note": "被リンクの多い順に並んだ一覧からの抽出であり、.jp ドメイン全体からの無作為抽出ではない。規模の大きい組織に偏る。"
  },
  "method": {
    "resolver": "DoH (Google / Cloudflare)",
    "scripts": [
      "scripts/measure-dmarc-rua.mjs",
      "scripts/measure-dkim-keys.mjs"
    ],
    "dmarcSpec": "RFC 9989 §4.7 / RFC 9990",
    "dkimSpec": "RFC 6376 §3.6.1 / RFC 8301 §3.2",
    "publicSuffixList": "https://publicsuffix.org/list/public_suffix_list.dat"
  },
  "dmarc": {
    "measuredAt": "2026-07-27",
    "scanned": 19065,
    "dnsQueries": 22302,
    "records": {
      "found": 10103,
      "notFound": 8831,
      "lookupFailed": 131,
      "foundRate": 53
    },
    "reporting": {
      "withRua": 5921,
      "withRuaRateOfFound": 58.6,
      "nonMailtoUri": 24,
      "domainsWithExternalDestination": 2901,
      "domainsAllExternalUnauthorized": 735,
      "domainsSomeExternalUnauthorized": 102,
      "allUnauthorizedRate": 25.3,
      "uriExternal": 3258,
      "uriAuthorized": 2401,
      "uriUnauthorized": 857,
      "uriUnauthorizedRate": 26.3
    }
  },
  "dkim": {
    "measuredAt": "2026-07-27",
    "scanned": 19065,
    "providerDetected": 9571,
    "domainsWithKey": 5304,
    "records": 9937,
    "testingModeRecords": 21,
    "keyLengthByRecord": [
      {
        "label": "2048 bit",
        "count": 7124,
        "rate": 71.7
      },
      {
        "label": "1024 bit",
        "count": 2747,
        "rate": 27.6
      },
      {
        "label": "1028 bit",
        "count": 41,
        "rate": 0.4
      },
      {
        "label": "4096 bit",
        "count": 2,
        "rate": 0
      },
      {
        "label": "768 bit",
        "count": 1,
        "rate": 0
      },
      {
        "label": "512 bit",
        "count": 1,
        "rate": 0
      },
      {
        "label": "解析できず",
        "count": 17,
        "rate": 0.2
      },
      {
        "label": "失効 (p= が空)",
        "count": 4,
        "rate": 0
      }
    ],
    "keyLengthByDomain": [
      {
        "label": "2048 bit",
        "count": 4328,
        "rate": 81.6
      },
      {
        "label": "1024 bit",
        "count": 2265,
        "rate": 42.7
      },
      {
        "label": "1028 bit",
        "count": 41,
        "rate": 0.8
      },
      {
        "label": "4096 bit",
        "count": 2,
        "rate": 0
      },
      {
        "label": "768 bit",
        "count": 1,
        "rate": 0
      },
      {
        "label": "512 bit",
        "count": 1,
        "rate": 0
      },
      {
        "label": "解析できず",
        "count": 16,
        "rate": 0.3
      },
      {
        "label": "失効 (p= が空)",
        "count": 4,
        "rate": 0.1
      }
    ]
  }
}