This document is obsolete. Please
refer to RFC 6890.
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.
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.
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].
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.
2002::/16 are the 6to4 addresses [RFC3056]. The 6to4 addresses may be advertised when the site is running a 6to4 relay or offering a 6to4 transit service. Running such a service [RFC3964] entails filtering rules specific to 6to4 [RFC3964]. IPv4 addresses disallowed in 6to4 prefixes are listed in section 5.3.1 of [RFC3964].
2001::/32 are the Teredo addresses [RFC4380]. The Teredo addresses may be advertised when the site is running a Teredo relay or offering a Teredo transit service.
5f00::/8 were the addresses of the first instance of the 6bone experimental network [RFC1897].
3ffe::/16 were the addresses of the second instance of the 6bone experimental network [RFC2471].
Both 5f00::/8 and 3ffe::/16 were returned to IANA [RFC3701]. These addresses are subject to future allocation, similar to current unallocated address space. Addresses within these blocks should not appear on the public Internet until they are reallocated.
2001:10::/28 are Overlay Routable Cryptographic Hash IDentifiers (ORCHID) addresses [RFC4843]. These addresses are used as identifiers and are not routable at the IP layer. Addresses within this block should not appear on the public Internet.
An IANA registry (iana-ipv6-special-registry) exists [RFC4773] for Special-Purpose IPv6 address block assignments for experiments and other purposes. Addresses within this registry should be reviewed for Internet routing considerations.
ff00::/8 are multicast addresses [RFC4291]. They contain a 4-bit scope in the address field where only some values are of global scope [RFC4291]. Only addresses with global scope in this block may appear on the public Internet.
Multicast routes must not appear in unicast routing tables.
To ensure consistency and to provide cross-referencing for the benefit of the community, IANA has inserted the following paragraph in the header of the iana-ipv6-special-registry.
"Other special IPv6 addresses requiring specific considerations for global routing are listed in RFC 5156."
Florent Parent, Pekka Savola, Tim Chown, Alain Baudot, Stig Venaas, Vincent Jardin, Olaf Bonness, David Green, Gunter Van de Velde, Michael Barnes, Fred Baker, Edward Lewis, Marla Azinger, Brian Carpenter, Mark Smith, Kevin Loch, Alain Durand, Jim Bound, Peter Sherbin, Bob Hinden, Gert Doering, Niall O'Reilly, Mark Townsley, Jari Arkko, and Iain Calder have provided input and suggestions to this document.
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