{
  "name": "SiteKensa .jp ドメインのSPFポリシーとDNS参照回数",
  "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 SPF の all 修飾子、重複、DNS参照回数、void lookup、書式や参照先の問題、ptr の使用を集計した値。個々のドメイン名は含まない。",
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "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": 19535,
    "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)",
    "script": "scripts/measure-spf-policy.mjs",
    "spec": "RFC 7208 セクション4.5 / セクション4.6.4 / セクション5.1"
  },
  "measuredAt": "2026-08-23",
  "scanned": 19535,
  "dnsQueries": 75786,
  "records": {
    "found": 15490,
    "missing": 3908,
    "lookupFailed": 137,
    "foundRate": 79.3,
    "duplicate": 121,
    "singleRecord": 15369
  },
  "all": {
    "pass": {
      "count": 2,
      "rateOfSingleRecord": 0
    },
    "softfail": {
      "count": 12128,
      "rateOfSingleRecord": 78.9
    },
    "fail": {
      "count": 3055,
      "rateOfSingleRecord": 19.9
    },
    "neutral": {
      "count": 123,
      "rateOfSingleRecord": 0.8
    },
    "missing": {
      "count": 61,
      "rateOfSingleRecord": 0.4
    },
    "undetermined": {
      "count": 0,
      "rateOfSingleRecord": 0
    }
  },
  "decidedByRedirect": {
    "count": 57,
    "rateOfSingleRecord": 0.4
  },
  "lookups": {
    "zeroToSeven": {
      "count": 13408,
      "rateOfSingleRecord": 87.2
    },
    "eightToTen": {
      "count": 1642,
      "rateOfSingleRecord": 10.7
    },
    "overTen": {
      "count": 312,
      "rateOfSingleRecord": 2
    },
    "incomplete": {
      "count": 7,
      "rateOfSingleRecord": 0
    },
    "voidOverTwo": {
      "count": 10,
      "rateOfSingleRecord": 0.1
    }
  },
  "voidLookups": {
    "zero": {
      "count": 15020,
      "rateOfSingleRecord": 97.7
    },
    "one": {
      "count": 309,
      "rateOfSingleRecord": 2
    },
    "two": {
      "count": 30,
      "rateOfSingleRecord": 0.2
    },
    "overTwo": {
      "count": 10,
      "rateOfSingleRecord": 0.1
    }
  },
  "referenceMissing": {
    "count": 116,
    "rateOfSingleRecord": 0.8
  },
  "problems": {
    "any": {
      "count": 349,
      "rateOfFound": 2.3
    },
    "own": {
      "count": 80,
      "rateOfFound": 0.5
    },
    "referenced": {
      "count": 269,
      "rateOfFound": 1.7
    },
    "kinds": {
      "emptyModifierValue": 0,
      "unparsableTerm": 51,
      "unknownMechanism": 20,
      "missingTarget": 3,
      "duplicateModifier": 0,
      "tooDeep": 0,
      "loop": 27,
      "noSpfAtReference": 242,
      "noSpfAtRedirect": 0,
      "multipleAtReference": 3,
      "invalidIpValue": 7,
      "invalidCidr": 6,
      "cidrNotAllowed": 0,
      "valueNotAllowed": 0,
      "missingIpValue": 7,
      "other": 0
    },
    "kindsOwn": {
      "emptyModifierValue": 0,
      "unparsableTerm": 48,
      "unknownMechanism": 18,
      "missingTarget": 3,
      "duplicateModifier": 0,
      "tooDeep": 0,
      "loop": 0,
      "noSpfAtReference": 0,
      "noSpfAtRedirect": 0,
      "multipleAtReference": 0,
      "invalidIpValue": 7,
      "invalidCidr": 6,
      "cidrNotAllowed": 0,
      "valueNotAllowed": 0,
      "missingIpValue": 7,
      "other": 0
    },
    "kindsReferenced": {
      "emptyModifierValue": 0,
      "unparsableTerm": 3,
      "unknownMechanism": 2,
      "missingTarget": 0,
      "duplicateModifier": 0,
      "tooDeep": 0,
      "loop": 27,
      "noSpfAtReference": 242,
      "noSpfAtRedirect": 0,
      "multipleAtReference": 3,
      "invalidIpValue": 0,
      "invalidCidr": 0,
      "cidrNotAllowed": 0,
      "valueNotAllowed": 0,
      "missingIpValue": 0,
      "other": 0
    }
  },
  "ptr": {
    "count": 28,
    "rateOfFound": 0.2
  }
}