{
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    "abstract": "The much larger default 64-bit subnet address space of IPv6 should in principle make traditional network (port) scanning techniques used by certain network worms or scanning tools less effective. While traditional network scanning probes (whether by individuals or automated via network worms) may become less common, administrators should be aware that attackers may use other techniques to discover IPv6 addresses on a target network, and thus they should also be aware of measures that are available to mitigate them. This informational document discusses approaches that administrators could take when planning their site address allocation and management strategies as part of a defence-in-depth approach to network security. This memo provides information for the Internet community.",
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      "sourceUrl": "https://www.rfc-editor.org/info/rfc5157/",
      "updated": "2026-10-16T20:42:37.670Z",
      "version": "extractDocs.js@commit:2c3b1db1b97b"
    },
    "authors": [
      {
        "name": "Tim Chown"
      }
    ],
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      "confidence": "high",
      "note": "Parsed from Datatracker doc page article:author (profile full names)",
      "originalValue": null,
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      "updated": "2026-10-16T20:42:37.670Z",
      "version": "extractDocs.js@commit:2c3b1db1b97b"
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    "docId": "RFC5157",
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      "confidence": "high",
      "note": "Derived from RFC number or Datatracker identifier",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5157/",
      "updated": "2026-10-16T20:42:37.670Z",
      "version": "extractDocs.js@commit:2c3b1db1b97b"
    },
    "docLabel": "IETF RFC 5157",
    "docLabel$meta": {
      "confidence": "high",
      "note": "Constructed from provider and document identifier",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5157/",
      "updated": "2026-10-16T20:42:37.670Z",
      "version": "extractDocs.js@commit:2c3b1db1b97b"
    },
    "docNumber": "5157",
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      "confidence": "high",
      "note": "Parsed from RFC info page report metadata",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5157/",
      "updated": "2026-10-16T20:42:37.670Z",
      "version": "extractDocs.js@commit:2c3b1db1b97b"
    },
    "docTitle": "IPv6 Implications for Network Scanning",
    "docTitle$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML title",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5157/",
      "updated": "2026-10-16T20:42:37.670Z",
      "version": "extractDocs.js@commit:2c3b1db1b97b"
    },
    "docType": "Informational",
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      "confidence": "high",
      "note": "Mapped from Datatracker std_level or RFC status text",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5157/",
      "updated": "2026-10-16T20:42:37.670Z",
      "version": "extractDocs.js@commit:2c3b1db1b97b"
    },
    "doi": "10.17487/RFC5157",
    "doi$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML doi",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5157/",
      "updated": "2026-10-16T20:42:37.670Z",
      "version": "extractDocs.js@commit:2c3b1db1b97b"
    },
    "href": "https://doi.org/10.17487/RFC5157",
    "href$meta": {
      "confidence": "high",
      "note": "Derived from DOI (https://doi.org/<doi>)",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5157/",
      "updated": "2026-10-16T20:42:37.670Z",
      "version": "extractDocs.js@commit:2c3b1db1b97b"
    },
    "keywords": [
      "Subnet Address Space"
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    "keywords$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML keywords",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5157/",
      "updated": "2026-10-16T20:42:37.670Z",
      "version": "extractDocs.js@commit:2c3b1db1b97b"
    },
    "pages": "13",
    "pages$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML page-count",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5157/",
      "updated": "2026-10-16T20:42:37.670Z",
      "version": "extractDocs.js@commit:2c3b1db1b97b"
    },
    "publicationDate": "2008-03-01",
    "publicationDate$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML date",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5157/",
      "updated": "2026-10-16T20:42:37.670Z",
      "version": "extractDocs.js@commit:2c3b1db1b97b"
    },
    "publisher": "IETF",
    "publisher$meta": {
      "confidence": "high",
      "note": "Static: provider",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5157/",
      "updated": "2026-10-16T20:42:37.670Z",
      "version": "extractDocs.js@commit:2c3b1db1b97b"
    },
    "references": {
      "bibliographic": [
        "RFC2460",
        "RFC4862",
        "RFC4941",
        "RFC3056",
        "RFC3306",
        "RFC3315",
        "RFC3956",
        "RFC3971",
        "RFC3972",
        "RFC4214",
        "RFC4380",
        "RFC4942",
        "orphan/RFC5157/h:2c9d494f"
      ],
      "bibliographic$meta": {
        "confidence": "medium",
        "flag": "MIXED_REF_LAYOUT_RISK anchored=13 proseBlocks=15 skippedAnchorBlocks=14",
        "note": "Parsed from RFC HTML references/informative sections",
        "originalValue": [],
        "reviewRequired": true,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc5157/",
        "updated": "2026-10-16T20:42:37.670Z",
        "version": "extractDocs.js@commit:2c3b1db1b97b"
      }
    },
    "resolvedHref": "https://www.rfc-editor.org/info/rfc5157/",
    "resolvedHref$meta": {
      "confidence": "high",
      "note": "Final URL resolved via URL redirect verification",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5157/",
      "updated": "2026-10-16T20:42:37.670Z",
      "version": "extractDocs.js@commit:2c3b1db1b97b"
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      "active": false,
      "active$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc5157/",
        "updated": "2026-10-16T20:42:37.670Z",
        "version": "extractDocs.js@commit:2c3b1db1b97b"
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      "errataExist": false,
      "errataExist$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/rfc5157/",
        "updated": "2026-10-16T20:42:37.670Z",
        "version": "extractDocs.js@commit:2c3b1db1b97b"
      },
      "latestVersion": false,
      "latestVersion$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc5157/",
        "updated": "2026-10-16T20:42:37.670Z",
        "version": "extractDocs.js@commit:2c3b1db1b97b"
      },
      "statusNote": "Informational",
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        "confidence": "high",
        "note": "Mapped from Datatracker doc.json std_level",
        "originalValue": null,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc5157/",
        "updated": "2026-10-16T20:42:37.670Z",
        "version": "extractDocs.js@commit:2c3b1db1b97b"
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      "superseded": true,
      "superseded$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc5157/",
        "updated": "2026-10-16T20:42:37.670Z",
        "version": "extractDocs.js@commit:2c3b1db1b97b"
      },
      "supersededBy": [
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      "supersededBy$meta": {
        "confidence": "high",
        "note": "Parsed from RFC index XML",
        "originalValue": [],
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc5157/",
        "updated": "2026-10-16T20:42:37.670Z",
        "version": "extractDocs.js@commit:2c3b1db1b97b"
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