{
  "$schema": "/api/schemas/documents.schema.json",
  "apiVersion": "1.1.0",
  "lastModified": "2026-10-13T17:24:06.923Z",
  "sourcePath": "src/main/data/docs",
  "docId": "RFC4727",
  "document": {
    "abstract": "When experimenting with or extending protocols, it is often necessary to use some sort of protocol number or constant in order to actually test or experiment with the new function, even when testing in a closed environment. This document reserves some ranges of numbers for experimentation purposes in specific protocols where the need to support experimentation has been identified, and it describes the numbers that have already been reserved by other documents. [STANDARDS-TRACK]",
    "abstract$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML abstract",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4727/",
      "updated": "2026-10-13T17:23:33.357Z",
      "version": "extractDocs.js@commit:996495349225"
    },
    "authors": [
      {
        "name": "Bill Fenner"
      }
    ],
    "authors$meta": {
      "confidence": "high",
      "note": "Parsed from Datatracker doc page article:author (profile full names)",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4727/",
      "updated": "2026-10-13T17:23:33.357Z",
      "version": "extractDocs.js@commit:996495349225"
    },
    "docId": "RFC4727",
    "docId$meta": {
      "confidence": "high",
      "note": "Derived from RFC number or Datatracker identifier",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4727/",
      "updated": "2026-10-13T17:23:33.357Z",
      "version": "extractDocs.js@commit:996495349225"
    },
    "docLabel": "IETF RFC 4727",
    "docLabel$meta": {
      "confidence": "high",
      "note": "Constructed from provider and document identifier",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4727/",
      "updated": "2026-10-13T17:23:33.357Z",
      "version": "extractDocs.js@commit:996495349225"
    },
    "docNumber": "4727",
    "docNumber$meta": {
      "confidence": "high",
      "note": "Parsed from RFC info page report metadata",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4727/",
      "updated": "2026-10-13T17:23:33.357Z",
      "version": "extractDocs.js@commit:996495349225"
    },
    "docTitle": "Experimental Values In IPv4, IPv6, ICMPv4, ICMPv6, UDP, and TCP Headers",
    "docTitle$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML title",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4727/",
      "updated": "2026-10-13T17:23:33.357Z",
      "version": "extractDocs.js@commit:996495349225"
    },
    "docType": "Standard",
    "docType$meta": {
      "confidence": "high",
      "note": "Mapped from Datatracker std_level or RFC status text",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4727/",
      "updated": "2026-10-13T17:23:33.357Z",
      "version": "extractDocs.js@commit:996495349225"
    },
    "doi": "10.17487/RFC4727",
    "doi$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML doi",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4727/",
      "updated": "2026-10-13T17:23:33.357Z",
      "version": "extractDocs.js@commit:996495349225"
    },
    "href": "https://doi.org/10.17487/RFC4727",
    "href$meta": {
      "confidence": "high",
      "note": "Derived from DOI (https://doi.org/<doi>)",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4727/",
      "updated": "2026-10-13T17:23:33.357Z",
      "version": "extractDocs.js@commit:996495349225"
    },
    "pages": "11",
    "pages$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML page-count",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4727/",
      "updated": "2026-10-13T17:23:33.357Z",
      "version": "extractDocs.js@commit:996495349225"
    },
    "publicationDate": "2006-11-01",
    "publicationDate$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML date",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4727/",
      "updated": "2026-10-13T17:23:33.357Z",
      "version": "extractDocs.js@commit:996495349225"
    },
    "publisher": "IETF",
    "publisher$meta": {
      "confidence": "high",
      "note": "Static: provider",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4727/",
      "updated": "2026-10-13T17:23:33.357Z",
      "version": "extractDocs.js@commit:996495349225"
    },
    "references": {
      "bibliographic": [
        "orphan/RFC4727/h:1addf54b"
      ],
      "bibliographic$meta": {
        "confidence": "medium",
        "note": "Citations without a standard ID, kept as MRI orphan refs (or resolved once the reference label was stripped)",
        "originalValue": null,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4727/",
        "updated": "2026-10-13T17:24:06.923Z",
        "version": "extractDocs.js@commit:996495349225"
      },
      "normative": [
        "RFC791",
        "RFC1918",
        "RFC2365",
        "RFC2460",
        "RFC2461",
        "RFC2474",
        "RFC2780",
        "RFC2928",
        "RFC3168",
        "RFC3330",
        "RFC3692",
        "RFC3849",
        "RFC4193",
        "RFC4291",
        "RFC4302",
        "RFC4443"
      ],
      "normative$meta": {
        "confidence": "high",
        "note": "Parsed from RFC HTML normative references sections",
        "originalValue": [],
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4727/",
        "updated": "2026-10-13T17:23:33.357Z",
        "version": "extractDocs.js@commit:996495349225"
      }
    },
    "resolvedHref": "https://www.rfc-editor.org/info/rfc4727/",
    "resolvedHref$meta": {
      "confidence": "high",
      "note": "Final URL resolved via URL redirect verification",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4727/",
      "updated": "2026-10-13T17:23:33.357Z",
      "version": "extractDocs.js@commit:996495349225"
    },
    "status": {
      "active": true,
      "active$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4727/",
        "updated": "2026-10-13T17:23:33.357Z",
        "version": "extractDocs.js@commit:996495349225"
      },
      "errataExist": false,
      "errataExist$meta": {
        "confidence": "high",
        "note": "Derived from presence of errata links on RFC/Datatracker pages",
        "originalValue": null,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4727/",
        "updated": "2026-10-13T17:23:33.357Z",
        "version": "extractDocs.js@commit:996495349225"
      },
      "latestVersion": true,
      "latestVersion$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4727/",
        "updated": "2026-10-13T17:23:33.357Z",
        "version": "extractDocs.js@commit:996495349225"
      },
      "statusNote": "Proposed Standard",
      "statusNote$meta": {
        "confidence": "high",
        "note": "Mapped from Datatracker doc.json std_level",
        "originalValue": null,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4727/",
        "updated": "2026-10-13T17:23:33.357Z",
        "version": "extractDocs.js@commit:996495349225"
      },
      "superseded": false,
      "superseded$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4727/",
        "updated": "2026-10-13T17:23:33.357Z",
        "version": "extractDocs.js@commit:996495349225"
      }
    }
  }
}