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    "abstract": "The label stack encoding for Multi-protocol Label Switching (MPLS) defines a reserved label value known as \"IPv4 Explicit NULL\" and a reserved label value known as \"IPv6 Explicit NULL\". Previously, these labels were only legal when they occurred at the bottom of the MPLS label stack. This restriction is now removed, so that these label values may legally occur anywhere in the stack. This document updates RFC 3032. [STANDARDS-TRACK]",
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    "authors": [
      {
        "name": "Eric C. Rosen"
      }
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      "confidence": "high",
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      "confidence": "high",
      "note": "Parsed from RFC info page report metadata",
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      "updated": "2026-10-13T22:23:08.806Z",
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    "docTitle": "Removing a Restriction on the use of MPLS Explicit NULL",
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      "confidence": "high",
      "note": "Parsed from RFC index XML title",
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      "confidence": "high",
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      "confidence": "high",
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      "confidence": "high",
      "note": "Derived from DOI (https://doi.org/<doi>)",
      "originalValue": null,
      "source": "resolved",
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      "updated": "2026-10-13T22:23:08.806Z",
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      "MPLS"
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      "confidence": "high",
      "note": "Parsed from RFC index XML keywords",
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        "MPLS",
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      "overridden": true,
      "source": "parsed",
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      "confidence": "high",
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      "originalValue": null,
      "source": "parsed",
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      "confidence": "high",
      "note": "Parsed from RFC index XML date",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4182/",
      "updated": "2026-10-13T22:23:08.806Z",
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      "confidence": "high",
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      "source": "parsed",
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        "confidence": "medium",
        "flag": "MIXED_REF_LAYOUT_RISK anchored=2 proseBlocks=6 skippedAnchorBlocks=3",
        "note": "Parsed from RFC HTML references/informative sections",
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        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4182/",
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        "confidence": "high",
        "note": "Parsed from RFC HTML normative references sections",
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        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4182/",
        "updated": "2026-10-13T22:23:08.806Z",
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      "confidence": "high",
      "note": "Final URL resolved via URL redirect verification",
      "originalValue": null,
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      "updated": "2026-10-13T22:23:08.806Z",
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        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4182/",
        "updated": "2026-10-13T22:23:08.806Z",
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        "confidence": "high",
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        "source": "parsed",
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        "updated": "2026-10-13T22:23:08.806Z",
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        "confidence": "high",
        "note": "Parsed from RFC index XML",
        "originalValue": [],
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4182/",
        "updated": "2026-10-13T22:23:08.806Z",
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        "confidence": "high",
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        "source": "parsed",
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        "confidence": "high",
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        "source": "parsed",
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        "confidence": "high",
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        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4182/",
        "updated": "2026-10-13T22:23:08.806Z",
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        "source": "parsed",
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        "version": "extractDocs.js@commit:fd871efde64d"
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        "confidence": "high",
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        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4182/",
        "updated": "2026-10-13T22:23:08.806Z",
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