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HTTP/2 200 date: Thu, 09 Oct 2025 04:47:23 GMT content-type: text/html; charset=UTF-8 content-encoding: gzip set-cookie: PHPSESSID=2thpv2ff8bu0o8060tifs30f04; path=/ set-cookie: __cf_bm=bq8Cz2yGZEcwKLHT218xUsNSNPNmtCWPG9sdIZ4vLqw-1759985243-1.0.1.1-yacVlRqvezqIBB7uSIgfvMvYPJRafp0ZMdb7cTbCSLNSACY8Q6o39pfLpDXEn1wuMLKxMjxX1cPuBHIQYDw5565NEcePKxul09Hot_oVtPI; path=/; expires=Thu, 09-Oct-25 05:17:23 GMT; domain=.rfc-editor.org; HttpOnly; Secure; SameSite=None expires: Thu, 19 Nov 1981 08:52:00 GMT cache-control: no-store, no-cache, must-revalidate pragma: no-cache vary: Accept-Encoding strict-transport-security: max-age=31536000; includeSubDomains x-frame-options: SAMEORIGIN x-xss-protection: 1; mode=block x-content-type-options: nosniff cf-cache-status: DYNAMIC server: cloudflare cf-ray: 98bb3d57ed6b165e-BLR alt-svc: h3=":443"; ma=86400 RFC Errata Report » RFC Editor

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Found 1 record.

Status: Reported (1)

RFC 5453, "Reserved IPv6 Interface Identifiers", February 2009

Source of RFC: 6man (int)

Errata ID: 5589
Status: Reported
Type: Technical
Publication Format(s) : TEXT
Reported By: Brian Carpenter
Date Reported: 2019-01-02

Section 3 says:

   +-----------------------------------------+-------------------------+
   |        Interface Identifier Range       |       Description       |
   +-----------------------------------------+-------------------------+
   |           0000:0000:0000:0000           |  Subnet-Router Anycast  |
   |                                         |        [RFC4291]        |
   |                                         |                         |
   | FDFF:FFFF:FFFF:FF80-FDFF:FFFF:FFFF:FFFF | Reserved Subnet Anycast |
   |                                         |    Addresses[RFC2526]   |
   +-----------------------------------------+-------------------------+

                       Table 1: Current Assignments

It should say:

   +-----------------------------------------+-------------------------+
   |        Interface Identifier Range       |       Description       |
   +-----------------------------------------+-------------------------+
   |           0000:0000:0000:0000           |  Subnet-Router Anycast  |
   |                                         |        [RFC4291]        |
   |                                         |                         |
   | FDFF:FFFF:FFFF:FF80-FDFF:FFFF:FFFF:FFFF | Reserved Subnet Anycast |
   | FFFF:FFFF:FFFF:FF80-FFFF:FFFF:FFFF:FFFF |    Addresses[RFC2526]   |
   +-----------------------------------------+-------------------------+

                       Table 1: Current Assignments

Notes:

Both these ranges are in fact reserved by Section 2 of RFC2526. Under current recommendations [RFC7217] the FDFF range is no longer recommended for routine use, and the FFFF range is equally likely to occur in a pseudo-random 64-bit IID. Credit to Kerry Lynn for pointing this out.

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Status: Reported (1)

RFC 5453, "Reserved IPv6 Interface Identifiers", February 2009