{
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  "docId": "RFC4632",
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    "abstract": "This memo discusses the strategy for address assignment of the existing 32-bit IPv4 address space with a view toward conserving the address space and limiting the growth rate of global routing state. This document obsoletes the original Classless Inter-domain Routing (CIDR) spec in RFC 1519, with changes made both to clarify the concepts it introduced and, after more than twelve years, to update the Internet community on the results of deploying the technology described. This document specifies an Internet Best Current Practices for the Internet Community, and requests discussion and suggestions for improvements.",
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    "authors": [
      {
        "name": "Vince Fuller"
      },
      {
        "name": "Tony Li"
      }
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      "confidence": "high",
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      "updated": "2026-10-13T17:23:27.269Z",
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    "docId": "RFC4632",
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      "confidence": "high",
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      "originalValue": null,
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      "sourceUrl": "https://www.rfc-editor.org/info/rfc4632/",
      "updated": "2026-10-13T17:23:27.269Z",
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    "docLabel": "IETF RFC 4632",
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      "confidence": "high",
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      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4632/",
      "updated": "2026-10-13T17:23:27.269Z",
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    "docNumber": "4632",
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      "confidence": "high",
      "note": "Parsed from RFC info page report metadata",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4632/",
      "updated": "2026-10-13T17:23:27.269Z",
      "version": "extractDocs.js@commit:996495349225"
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    "docTitle": "Classless Inter-domain Routing (CIDR): The Internet Address Assignment and Aggregation Plan",
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      "confidence": "high",
      "note": "Parsed from RFC index XML title",
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      "updated": "2026-10-13T17:23:27.269Z",
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    "docType": "Best Practice",
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      "confidence": "high",
      "note": "Mapped from Datatracker std_level or RFC status text",
      "originalValue": null,
      "source": "parsed",
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      "updated": "2026-10-13T17:23:27.269Z",
      "version": "extractDocs.js@commit:996495349225"
    },
    "doi": "10.17487/RFC4632",
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      "confidence": "high",
      "note": "Parsed from RFC index XML doi",
      "originalValue": null,
      "source": "resolved",
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      "updated": "2026-10-13T17:23:27.269Z",
      "version": "extractDocs.js@commit:996495349225"
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    "href": "https://doi.org/10.17487/RFC4632",
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      "confidence": "high",
      "note": "Derived from DOI (https://doi.org/<doi>)",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4632/",
      "updated": "2026-10-13T17:23:27.269Z",
      "version": "extractDocs.js@commit:996495349225"
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    "keywords": [
      "CIDR-STRA"
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    "keywords$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML keywords",
      "originalValue": [
        "CIDR-STRA",
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      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4632/",
      "updated": "2026-10-13T17:53:26.890Z",
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      "confidence": "high",
      "note": "Parsed from RFC index XML page-count",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4632/",
      "updated": "2026-10-13T17:23:27.269Z",
      "version": "extractDocs.js@commit:996495349225"
    },
    "publicationDate": "2006-08-01",
    "publicationDate$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML date",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4632/",
      "updated": "2026-10-13T17:23:27.269Z",
      "version": "extractDocs.js@commit:996495349225"
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    "publisher": "IETF",
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      "confidence": "high",
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      "source": "parsed",
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        "IANA",
        "RFC904",
        "RFC1058",
        "RFC1195",
        "RFC1338",
        "RFC1380",
        "RFC1518",
        "RFC1519",
        "RFC2131",
        "RFC2328",
        "RFC2317",
        "RFC2453",
        "RFC3021",
        "RFC3221",
        "RFC4116",
        "RFC4271",
        "orphan/RFC4632/h:95ba7c29",
        "orphan/RFC4632/h:0f034d51",
        "orphan/RFC4632/h:6df6e0fb",
        "orphan/RFC4632/h:e91e845e",
        "orphan/RFC4632/h:267ebc9c",
        "orphan/RFC4632/h:dfd552a0",
        "orphan/RFC4632/h:325d0331"
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      "bibliographic$meta": {
        "confidence": "medium",
        "flag": "MIXED_REF_LAYOUT_RISK anchored=24 proseBlocks=27 skippedAnchorBlocks=25",
        "note": "Parsed from RFC HTML references/informative sections",
        "originalValue": [],
        "reviewRequired": true,
        "source": "parsed",
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        "version": "extractDocs.js@commit:996495349225"
      },
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        "confidence": "high",
        "note": "Parsed from RFC HTML normative references sections",
        "originalValue": [],
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4632/",
        "updated": "2026-10-13T17:23:27.269Z",
        "version": "extractDocs.js@commit:996495349225"
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    "resolvedHref": "https://www.rfc-editor.org/info/rfc4632/",
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      "confidence": "high",
      "note": "Final URL resolved via URL redirect verification",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4632/",
      "updated": "2026-10-13T17:23:27.269Z",
      "version": "extractDocs.js@commit:996495349225"
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      "active$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4632/",
        "updated": "2026-10-13T17:23:27.269Z",
        "version": "extractDocs.js@commit:996495349225"
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      "errataExist": true,
      "errataExist$meta": {
        "confidence": "high",
        "note": "Derived from presence of errata links on RFC/Datatracker pages",
        "originalValue": null,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4632/",
        "updated": "2026-10-13T17:23:27.269Z",
        "version": "extractDocs.js@commit:996495349225"
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      "errataUrl": [
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        "https://www.rfc-editor.org/errata_search.php?rfc=4632",
        "https://www.rfc-editor.org/rfc/inline-errata/rfc4632.html"
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      "errataUrl$meta": {
        "confidence": "high",
        "note": "Parsed from errata links on RFC/Datatracker pages",
        "originalValue": [],
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4632/",
        "updated": "2026-10-13T17:23:27.269Z",
        "version": "extractDocs.js@commit:996495349225"
      },
      "latestVersion": true,
      "latestVersion$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4632/",
        "updated": "2026-10-13T17:23:27.269Z",
        "version": "extractDocs.js@commit:996495349225"
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      "statusNote": "Best Current Practice",
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        "confidence": "high",
        "note": "Mapped from Datatracker doc.json std_level",
        "originalValue": null,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4632/",
        "updated": "2026-10-13T17:23:27.269Z",
        "version": "extractDocs.js@commit:996495349225"
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      "superseded": false,
      "superseded$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4632/",
        "updated": "2026-10-13T17:23:27.269Z",
        "version": "extractDocs.js@commit:996495349225"
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      "supersedes": [
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      "supersedes$meta": {
        "confidence": "high",
        "note": "Parsed from RFC index XML",
        "originalValue": [],
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4632/",
        "updated": "2026-10-13T17:23:27.269Z",
        "version": "extractDocs.js@commit:996495349225"
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