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Special-Use IPv6 Addresses
RFC 5156

Document type: RFC - Informational (April 2008; No errata)
Obsoleted by RFC 6890
Document stream: IETF
Last updated: 2013-03-02
Other versions: plain text, pdf, html

IETF State: (None)
Consensus: Unknown
Document shepherd: No shepherd assigned

IESG State: RFC 5156 (Informational)
Responsible AD: Ron Bonica
Send notices to: v6ops-chairs@tools.ietf.org, draft-ietf-v6ops-rfc3330-for-ipv6@tools.ietf.org

Network Working Group                                        M. Blanchet
Request for Comments: 5156                                      Viagenie
Category: Informational                                       April 2008

                       Special-Use IPv6 Addresses

Status of This Memo

   This memo provides information for the Internet community.  It does
   not specify an Internet standard of any kind.  Distribution of this
   memo is unlimited.

Abstract

   This document is a compilation of special IPv6 addresses defined in
   other RFCs.  It can be used as a checklist of invalid routing
   prefixes for developing filtering policies for routes and IP packets.
   It does not discuss addresses that are assigned to operators and
   users through the Regional Internet Registries.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 2
   2.  Address Blocks  . . . . . . . . . . . . . . . . . . . . . . . . 2
     2.1.  Node-Scoped Unicast . . . . . . . . . . . . . . . . . . . . 2
     2.2.  IPv4-Mapped Addresses . . . . . . . . . . . . . . . . . . . 2
     2.3.  IPv4-Compatible Addresses . . . . . . . . . . . . . . . . . 2
     2.4.  Link-Scoped Unicast . . . . . . . . . . . . . . . . . . . . 2
     2.5.  Unique-Local  . . . . . . . . . . . . . . . . . . . . . . . 3
     2.6.  Documentation Prefix  . . . . . . . . . . . . . . . . . . . 3
     2.7.  6to4  . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
     2.8.  Teredo  . . . . . . . . . . . . . . . . . . . . . . . . . . 3
     2.9.  6bone . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
     2.10. ORCHID  . . . . . . . . . . . . . . . . . . . . . . . . . . 3
     2.11. Default Route . . . . . . . . . . . . . . . . . . . . . . . 4
     2.12. IANA Special-Purpose IPv6 Address Registry  . . . . . . . . 4
     2.13. Multicast . . . . . . . . . . . . . . . . . . . . . . . . . 4
   3.  Security Considerations . . . . . . . . . . . . . . . . . . . . 4
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 4
   5.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . 4
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 5
     6.1.  Normative References  . . . . . . . . . . . . . . . . . . . 5
     6.2.  Informative References  . . . . . . . . . . . . . . . . . . 5

Blanchet                     Informational                      [Page 1]
RFC 5156               Special-Use IPv6 Addresses             April 2008

1.  Introduction

   This document is a compilation of special IPv6 addresses defined in
   other RFCs.  It can be used as a checklist of invalid routing
   prefixes for developing filtering policies for routes and IP packets.
   It does not discuss addresses that are assigned to operators and
   users through the Regional Internet Registries.

   The document is structured by address types.  The document format is
   similar to [RFC3330].

   Some tips about filtering are given, but are not mandatory to
   implement.

   The addresses listed in this document must not be hard-coded into
   implementations.

2.  Address Blocks

2.1.  Node-Scoped Unicast

   ::1/128 is the loopback address [RFC4291].

   ::/128 is the unspecified address [RFC4291].

   These two addresses should not appear on the public Internet.

2.2.  IPv4-Mapped Addresses

   ::FFFF:0:0/96 are the IPv4-mapped addresses [RFC4291].  Addresses
   within this block should not appear on the public Internet.

2.3.  IPv4-Compatible Addresses

   ::<ipv4-address>/96 are the IPv4-compatible addresses [RFC4291].
   These addresses are deprecated and should not appear on the public
   Internet.

2.4.  Link-Scoped Unicast

   fe80::/10 are the link-local unicast [RFC4291] addresses.  Addresses
   within this block should not appear on the public Internet.

Blanchet                     Informational                      [Page 2]
RFC 5156               Special-Use IPv6 Addresses             April 2008

2.5.  Unique-Local

   fc00::/7 are the unique-local addresses [RFC4193].  Addresses within
   this block should not appear by default on the public Internet.
   Procedures for advertising these addresses are further described in
   [RFC4193].

2.6.  Documentation Prefix

   The 2001:db8::/32 are the documentation addresses [RFC3849].  They
   are used for documentation purposes such as user manuals, RFCs, etc.
   Addresses within this block should not appear on the public Internet.

2.7.  6to4

   2002::/16 are the 6to4 addresses [RFC3056].  The 6to4 addresses may
   be advertised when the site is running a 6to4 relay or offering a

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