{
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  "docId": "RFC4213",
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    "abstract": "This document specifies IPv4 compatibility mechanisms that can be implemented by IPv6 hosts and routers. Two mechanisms are specified, dual stack and configured tunneling. Dual stack implies providing complete implementations of both versions of the Internet Protocol (IPv4 and IPv6), and configured tunneling provides a means to carry IPv6 packets over unmodified IPv4 routing infrastructures. This document obsoletes RFC 2893. [STANDARDS-TRACK]",
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      "confidence": "high",
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      "updated": "2026-10-13T22:23:11.304Z",
      "version": "extractDocs.js@commit:fd871efde64d"
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    "authors": [
      {
        "name": "Erik Nordmark"
      },
      {
        "name": "Robert E. Gilligan"
      }
    ],
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      "confidence": "high",
      "note": "Parsed from Datatracker doc page article:author (profile full names)",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4213/",
      "updated": "2026-10-13T22:23:11.304Z",
      "version": "extractDocs.js@commit:fd871efde64d"
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    "docId": "RFC4213",
    "docId$meta": {
      "confidence": "high",
      "note": "Derived from RFC number or Datatracker identifier",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4213/",
      "updated": "2026-10-13T22:23:11.304Z",
      "version": "extractDocs.js@commit:fd871efde64d"
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    "docLabel": "IETF RFC 4213",
    "docLabel$meta": {
      "confidence": "high",
      "note": "Constructed from provider and document identifier",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4213/",
      "updated": "2026-10-13T22:23:11.304Z",
      "version": "extractDocs.js@commit:fd871efde64d"
    },
    "docNumber": "4213",
    "docNumber$meta": {
      "confidence": "high",
      "note": "Parsed from RFC info page report metadata",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4213/",
      "updated": "2026-10-13T22:23:11.304Z",
      "version": "extractDocs.js@commit:fd871efde64d"
    },
    "docTitle": "Basic Transition Mechanisms for IPv6 Hosts and Routers",
    "docTitle$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML title",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4213/",
      "updated": "2026-10-13T22:23:11.304Z",
      "version": "extractDocs.js@commit:fd871efde64d"
    },
    "docType": "Standard",
    "docType$meta": {
      "confidence": "high",
      "note": "Mapped from Datatracker std_level or RFC status text",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4213/",
      "updated": "2026-10-13T22:23:11.304Z",
      "version": "extractDocs.js@commit:fd871efde64d"
    },
    "doi": "10.17487/RFC4213",
    "doi$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML doi",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4213/",
      "updated": "2026-10-13T22:23:11.304Z",
      "version": "extractDocs.js@commit:fd871efde64d"
    },
    "href": "https://doi.org/10.17487/RFC4213",
    "href$meta": {
      "confidence": "high",
      "note": "Derived from DOI (https://doi.org/<doi>)",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4213/",
      "updated": "2026-10-13T22:23:11.304Z",
      "version": "extractDocs.js@commit:fd871efde64d"
    },
    "keywords": [
      "TRANS-IPV6",
      "IPv4",
      "Dual Stack",
      "Configured Tunneling"
    ],
    "keywords$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML keywords",
      "originalValue": [
        "TRANS-IPV6",
        "IPv4",
        "Dual Sack",
        "Configured Tunneling"
      ],
      "overridden": true,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4213/",
      "updated": "2026-10-14T15:55:06.393Z",
      "version": "extractDocs.js@commit:ca62cd19765f"
    },
    "pages": "27",
    "pages$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML page-count",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4213/",
      "updated": "2026-10-13T22:23:11.304Z",
      "version": "extractDocs.js@commit:fd871efde64d"
    },
    "publicationDate": "2005-10-01",
    "publicationDate$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML date",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4213/",
      "updated": "2026-10-13T22:23:11.304Z",
      "version": "extractDocs.js@commit:fd871efde64d"
    },
    "publisher": "IETF",
    "publisher$meta": {
      "confidence": "high",
      "note": "Static: provider",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4213/",
      "updated": "2026-10-13T22:23:11.304Z",
      "version": "extractDocs.js@commit:fd871efde64d"
    },
    "references": {
      "bibliographic": [
        "RFC1435",
        "RFC1812",
        "RFC2401",
        "RFC2461",
        "RFC2462",
        "RFC2827",
        "RFC2890",
        "RFC2923",
        "RFC2983",
        "RFC3056",
        "RFC3168",
        "RFC3232",
        "RFC3484",
        "RFC3493",
        "RFC3513",
        "RFC3596",
        "RFC3704",
        "RFC4087",
        "RFC2893",
        "orphan/RFC4213/h:f7ab1ae7",
        "orphan/RFC4213/h:59960efb",
        "orphan/RFC4213/h:1a5edf7e",
        "orphan/RFC4213/h:38f9d8a1",
        "orphan/RFC4213/h:d8c7b6c4"
      ],
      "bibliographic$meta": {
        "confidence": "medium",
        "flag": "MIXED_REF_LAYOUT_RISK anchored=29 proseBlocks=33 skippedAnchorBlocks=31",
        "note": "Parsed from RFC HTML references/informative sections",
        "originalValue": [],
        "reviewRequired": true,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4213/",
        "updated": "2026-10-13T22:23:11.304Z",
        "version": "extractDocs.js@commit:fd871efde64d"
      },
      "normative": [
        "RFC791",
        "RFC1191",
        "RFC1981",
        "RFC2119",
        "RFC2460",
        "RFC2463"
      ],
      "normative$meta": {
        "confidence": "high",
        "note": "Parsed from RFC HTML normative references sections",
        "originalValue": [],
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4213/",
        "updated": "2026-10-13T22:23:11.304Z",
        "version": "extractDocs.js@commit:fd871efde64d"
      }
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    "resolvedHref": "https://www.rfc-editor.org/info/rfc4213/",
    "resolvedHref$meta": {
      "confidence": "high",
      "note": "Final URL resolved via URL redirect verification",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4213/",
      "updated": "2026-10-13T22:23:11.304Z",
      "version": "extractDocs.js@commit:fd871efde64d"
    },
    "status": {
      "active": true,
      "active$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4213/",
        "updated": "2026-10-13T22:23:11.304Z",
        "version": "extractDocs.js@commit:fd871efde64d"
      },
      "errataExist": true,
      "errataExist$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/rfc4213/",
        "updated": "2026-10-13T22:23:11.304Z",
        "version": "extractDocs.js@commit:fd871efde64d"
      },
      "errataUrl": [
        "https://www.rfc-editor.org/errata/rfc4213",
        "https://www.rfc-editor.org/errata_search.php?rfc=4213"
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      "errataUrl$meta": {
        "confidence": "high",
        "note": "Parsed from errata links on RFC/Datatracker pages",
        "originalValue": [],
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4213/",
        "updated": "2026-10-13T22:23:11.304Z",
        "version": "extractDocs.js@commit:fd871efde64d"
      },
      "latestVersion": true,
      "latestVersion$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4213/",
        "updated": "2026-10-13T22:23:11.304Z",
        "version": "extractDocs.js@commit:fd871efde64d"
      },
      "statusNote": "Proposed Standard",
      "statusNote$meta": {
        "confidence": "high",
        "note": "Mapped from Datatracker doc.json std_level",
        "originalValue": null,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4213/",
        "updated": "2026-10-13T22:23:11.304Z",
        "version": "extractDocs.js@commit:fd871efde64d"
      },
      "superseded": false,
      "superseded$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4213/",
        "updated": "2026-10-13T22:23:11.304Z",
        "version": "extractDocs.js@commit:fd871efde64d"
      },
      "supersedes": [
        "RFC2893"
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      "supersedes$meta": {
        "confidence": "high",
        "note": "Parsed from RFC index XML",
        "originalValue": [],
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4213/",
        "updated": "2026-10-13T22:23:11.304Z",
        "version": "extractDocs.js@commit:fd871efde64d"
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}