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IETF RFC 5736
IANA IPv4 Special Purpose Address Registry
Last modified on Thursday, January 7th, 2010
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Internet Engineering Task Force (IETF) G. Huston
Request for Comments: 5736 APNIC
Category: Informational M. Cotton
ISSN: 2070-1721 L. Vegoda
ICANN
January 2010
IANA IPv4 Special Purpose Address Registry
 Abstract
This is a direction to IANA concerning the creation and management of
the IANA IPv4 Special Purpose Address Registry.
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for informational purposes.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Not all documents
approved by the IESG are a candidate for any level of Internet
Standard; see Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/RFC 5736.
Copyright Notice
Copyright (c) 2010 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
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RFC 5736 IPv4 Special Registry January 2010
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 2
2. IANA IPv4 Special Purpose Address Block . . . . . . . . . . . . 2
3. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 3
4. Security Considerations . . . . . . . . . . . . . . . . . . . . 4
5. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 4
6. Informative References . . . . . . . . . . . . . . . . . . . . 5
1. Introduction
This is a direction to [IANA] concerning the creation and management
of the IANA IPv4 Special Purpose Address Registry. The registry will
be used for recording IETF protocol assignments from 192.0.0.0/24 and
any other address prefixes allocated to the registry in the future,
as described in Section 3.
2. IANA IPv4 Special Purpose Address Block
[RFC 5735] records the assignment of an IPv4 address prefix to IANA
for IETF protocol assignments.
192.0.0.0/24 - This block is reserved for IETF protocol
assignments.
This address allocation to IANA is intended to support IETF protocol
assignments. A more general view of the roles of IANA with respect
to address allocation functions is documented in [RFC 2860]:
4.3. [...] Note that [...] (b) assignments of specialised address
blocks (such as multicast or anycast blocks), and (c) experimental
assignments are not considered to be policy issues, and shall
remain subject to the provisions of this Section 4. (For purposes
of this MOU, the term "assignments" includes allocations.)
The reference to Section 4 here is to the general technical work for
the IANA as described in [RFC 2860]:
4.1. The IANA will assign and register Internet protocol
parameters only as directed by the criteria and procedures
specified in RFCs, including Proposed, Draft, and full Internet
Standards and Best Current Practice documents, and any other RFC
that calls for IANA assignment.
This document directs IANA to designate special purpose address
blocks in compliance with [RFC 2860].
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RFC 5736 IPv4 Special Registry January 2010
This document directs IANA to open an IPv4 Special Purpose Address
Registry for the management of these IANA-designated address blocks.
Special Purpose registrations to be made from this registry include
addresses for IETF protocol assignments and other special purpose
cases, as documented in IESG-reviewed RFCs, according to the
provisions described in Section 4.1 of [RFC 2860].
3. IANA Considerations
IANA maintains an "IANA IPv4 Special Purpose Address Registry". The
registry records current IANA address designations from the IANA-
managed IPv4 Special Purpose address pool.
This recommendation concerns the management of the address pool used
for IETF protocol assignments as documented in [RFC 5735] -- namely,
192.0.0.0/24. Following the policies outlined in [RFC 5226], further
assignments of address space to IANA for subsequent designation of
address prefixes for the purposes listed here shall be undertaken
only through an IETF Review action.
IANA may make Special Purpose address designations to support testing
or experimental usage activities initiated by the IETF, or for
specialised use of a designated address block in a context (e.g.,
anycast) associated with an Internet Standards Track protocol. All
such address designations must be documented in the "IANA
Considerations" section of an IESG-reviewed RFC.
The IANA IPv4 Special Purpose Address Registry records, for all
current address designations undertaken by IANA:
1. The designated address prefix.
2. The RFC that called for the IANA address designation.
3. The date the designation was made.
4. The date the use designation is to be terminated (if specified as
a limited-use designation).
5. The nature of the purpose of the designated address (e.g.,
unicast experiment or protocol service anycast).
6. For experimental unicast applications and otherwise as
appropriate, the registry will also identify the entity and
related contact details to whom the address designation has been
made.
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RFC 5736 IPv4 Special Registry January 2010
7. The registry will also note, for each designation, the intended
routing scope of the address, indicating whether the address is
intended to be routable only in scoped, local, or private
contexts, or whether the address prefix is intended to be routed
globally.
8. The date in the IANA registry is the date of the IANA action,
i.e., the day IANA records the allocation.
The IANA registry notes, as a general comment, that address prefixes
listed in the IPv4 Special Purpose Address Registry are not
guaranteed routability in any particular local or global context.
IANA will not maintain further sub-registries for any IPv4 Special
Purpose address block designated according to this direction.
4. Security Considerations
Security of the Internet's routing system relies on the ability to
authenticate an assertion of unique control of an address block.
Measures to authenticate such assertions rely on validation that the
address block forms part of an existing allocated address block, and
that there is a trustable and unique reference in the IANA address
registries.
This registry is intended to provide an authoritative source of
information regarding the currency and intended purpose of IPv4
Special Purpose address blocks that are designated from the IANA-
administered IPv4 Special Purpose address pool. This is a small step
towards the creation of a comprehensive registry framework that can
be used as a trust point for commencing a chain of address
validation. Consideration should be given to the use of file
signatures and associated certificate mechanisms to allow
applications to confirm that the registry contents are current, and
that they have been published by the IANA.
5. Acknowledgements
This document is based on [RFC 4773], which was prepared with the
assistance of Leslie Daigle, Brian Haberman, Bob Hinden, David
Kessens, Kurt Lindqvist, Thomas Narten, and Paul Wilson. While all
these individuals were not explicitly consulted in the preparation of
this document, their original contribution is acknowledged here.
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RFC 5736 IPv4 Special Registry January 2010
6. Informative References
[IANA] IANA, "IANA Matrix for Protocol Parameter Assignment/
Registration Procedures",
<http://www.iana.org/numbers.html>.
[RFC 2860] Carpenter, B., Baker, F., and M. Roberts, "Memorandum of
Understanding Concerning the Technical Work of the
Internet Assigned Numbers Authority", RFC 2860, June 2000.
[RFC 4773] Huston, G., "Administration of the IANA Special Purpose
IPv6 Address Block", RFC 4773, December 2006.
[RFC 5226] Narten, T. and H. Alvestrand, "Guidelines for Writing an
IANA Considerations Section in RFCs", BCP 26, RFC 5226,
May 2008.
[RFC 5735] Cotton, M. and L. Vegoda, "Special Use IPv4 Addresses",
BCP 153, RFC 5735, January 2010.
Huston, et al. Informational PAGE 5
RFC 5736 IPv4 Special Registry January 2010
Authors' Addresses
Geoff Huston
Asia Pacific Network Information Centre
PO Box 2131
Milton, QLD 4064
Australia
Phone: +61-7-3858-3100
EMail: gih@apnic.net
URI: http://www.apnic.net/
Michelle Cotton
Internet Corporation for Assigned Names and Numbers
4676 Admiralty Way, Suite 330
Marina del Rey, CA 90292-6601
USA
Phone: +1-310-823-9358
EMail: michelle.cotton@icann.org
URI: http://www.iana.org/
Leo Vegoda
Internet Corporation for Assigned Names and Numbers
4676 Admiralty Way, Suite 330
Marina del Rey, CA 90292-6601
USA
Phone: +1-310-823-9358
EMail: leo.vegoda@icann.org
URI: http://www.iana.org/
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IANA IPv4 Special Purpose Address Registry
RFC TOTAL SIZE: 10823 bytes
PUBLICATION DATE: Thursday, January 7th, 2010
LEGAL RIGHTS: The IETF Trust (see BCP 78)
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