{
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    "abstract": "IPv6 prefix length, as in IPv4, is a parameter conveyed and used in IPv6 routing and forwarding processes in accordance with the Classless Inter-domain Routing (CIDR) architecture. The length of an IPv6 prefix may be any number from zero to 128, although subnets using stateless address autoconfiguration (SLAAC) for address allocation conventionally use a /64 prefix. Hardware and software implementations of routing and forwarding should therefore impose no rules on prefix length, but implement longest-match-first on prefixes of any valid length.",
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    "authors": [
      {
        "name": "Mohamed Boucadair"
      },
      {
        "name": "Alexandre Petrescu"
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      {
        "name": "Fred Baker"
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    "docTitle": "IPv6 Prefix Length Recommendation for Forwarding",
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      "confidence": "high",
      "note": "Parsed from RFC index XML title",
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    },
    "doi": "10.17487/RFC7608",
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      "confidence": "high",
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      "source": "resolved",
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    "keywords": [
      "IPv6 Routing",
      "CIDR",
      "IPv6 Addressing Architecture",
      "FIB",
      "RIB",
      "IPv6 Deployment"
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    "keywords$meta": {
      "confidence": "high",
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      "originalValue": [
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        "CIDR",
        "Classless Inter-Domain Routing",
        "IPv6 Addressing Architecture",
        "IPv6 Forwarding Information Base",
        "IPv6 Routing Information Base",
        "FIB",
        "RIB",
        "IPv6 Deployment"
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      "confidence": "high",
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    },
    "publicationDate": "2015-07-01",
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        "RFC2464",
        "RFC3315",
        "RFC4862",
        "RFC4942",
        "RFC6164",
        "RFC7421"
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        "confidence": "medium",
        "flag": "MIXED_REF_LAYOUT_RISK anchored=11 proseBlocks=16 skippedAnchorBlocks=13",
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        "updated": "2026-10-20T17:31:23.113Z",
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      },
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        "RFC2119",
        "RFC4291",
        "RFC4632"
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        "confidence": "high",
        "note": "Parsed from RFC HTML normative references sections",
        "originalValue": [],
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc7608/",
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    "resolvedHref": "https://www.rfc-editor.org/info/rfc7608/",
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        "confidence": "high",
        "note": "Derived from supersession relationship fields",
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        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc7608/",
        "updated": "2026-10-20T17:31:23.113Z",
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        "source": "parsed",
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      "latestVersion$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc7608/",
        "updated": "2026-10-20T17:31:23.113Z",
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        "source": "parsed",
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        "source": "resolved",
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