{
  "number": 9977,
  "title": "Publishing End-Site Prefix Lengths",
  "authors": [
    "O. Gasser",
    "R. Bush",
    "M. Candela",
    "R. Housley"
  ],
  "published": "2026-05",
  "status": "Proposed Standard",
  "stream": "IETF",
  "area": "ops",
  "working_group": "opsawg",
  "pages": 26,
  "formats": [
    "HTML",
    "TXT",
    "PDF",
    "XML"
  ],
  "abstract": "This document specifies how to augment the Routing Policy Specification Language (RPSL) inetnum: class to refer specifically to prefixlen files, which are Comma-Separated Values (CSV) files used to specify end-site prefix lengths. This document also describes an optional mechanism that uses the Resource Public Key Infrastructure (RPKI) to authenticate the prefixlen files.",
  "keywords": [
    "prefix",
    "allocation",
    "RPSL",
    "inetnum"
  ],
  "draft": "draft-ietf-opsawg-prefix-lengths-14",
  "doi": "10.17487/RFC9977",
  "urls": {
    "html": "https://rfc.dk/rfc9977/",
    "text": "https://rfc.dk/rfc9977.txt",
    "rfc_editor": "https://www.rfc-editor.org/rfc/rfc9977",
    "datatracker": "https://datatracker.ietf.org/doc/rfc9977/"
  },
  "text_modified": "2026-05-29T18:14:01.479268074Z"
}