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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.






Huston, et al.               Informational                   PAGE 1 top


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]. Huston, et al. Informational PAGE 2 top

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. Huston, et al. Informational PAGE 3 top

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. Huston, et al. Informational PAGE 4 top

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 top

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/ Huston, et al. Informational PAGE 6 top

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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