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Internet Engineering Task Force (IETF)                        R. HousleyRequest for Comments: 7249                                Vigil SecurityCategory: Informational                                         May 2014ISSN: 2070-1721Internet Numbers RegistriesAbstractRFC 7020 provides information about the Internet Numbers Registry   System and how it is used in the distribution of autonomous system   (AS) numbers and globally unique unicast Internet Protocol (IP)   address space.   This companion document identifies the IANA registries that are part   of the Internet Numbers Registry System at this time.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; seeSection 2 of RFC 5741.   Information about the current status of this document, any errata,   and how to provide feedback on it may be obtained athttp://www.rfc-editor.org/info/rfc7249.Copyright Notice   Copyright (c) 2014 IETF Trust and the persons identified as the   document authors.  All rights reserved.   This document is subject toBCP 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.Housley                       Informational                     [Page 1]

RFC 7249               Internet Numbers Registries              May 20141.  Introduction   In accordance with the IETF-IANA Memorandum of Understanding   [RFC2860],RFC 7020 [RFC7020] provides information about the Internet   Numbers Registry System and how it is used in the distribution of   autonomous system (AS) numbers and globally unique unicast Internet   Protocol (IP) address space.   This companion document identifies the IANA registries that are part   of the Internet Numbers Registry System at this time.2.  Internet Numbers Registries   Three IANA registries are associated with the Internet Numbers   Registry System: "Autonomous System (AS) Numbers", "IANA IPv4 Address   Space Registry", and "IPv6 Global Unicast Address Assignments".   However, in each case, there are special-purpose values, and those   special-purpose values are outside the Internet Numbers Registry   System.2.1.  Autonomous System Numbers   For historical reasons, there are 16-bit AS numbers and 32-bit AS   numbers.  However, the 16-bit AS numbers are really just zero through   65535 of the 32-bit AS number space.   The allocation and registration functions for all non-reserved AS   numbers are handled by the Internet Numbers Registry System in   accordance with policies developed by the Regional Internet   Registries (RIRs) in accordance with their processes.   Some special-purpose AS numbers have been reserved.Section 3 of   this document establishes an IANA registry for special-purpose AS   Numbers that have already been reserved.  Future additions to this   registry can be made through "IETF Review" as defined in [RFC5226].   Once a reservation is approved, it is recorded in the special-purpose   AS numbers registry with a reference to the IESG-approved RFC that   documents the reservation.Housley                       Informational                     [Page 2]

RFC 7249               Internet Numbers Registries              May 20142.2.  IPv4 Addresses   The allocation and registration functions for all non-reserved,   globally unique unicast IPv4 addresses are handled by the Internet   Numbers Registry System in accordance with policies developed by the   RIRs in accordance with their processes.   Reservations of special-purpose IPv4 addresses can be found in the   IANA registry [IANA-IPv4-Reg].  Future additions to this registry can   be made through "IETF Review" as defined in [RFC5226].  Once a   reservation is approved, it is recorded in the special-purpose IPv4   address registry with a reference to the IESG-approved RFC that   documents the reservation.2.3.  IPv6 Addresses   The vast bulk of the IPv6 address space (approximately 7/8ths of the   whole address space) is reserved by the IETF [RFC4291], with the   expectation that further assignment of globally unique unicast   address space will be made from this reserved space in accordance   with future needs.   The allocation and registration functions for all non-reserved   globally unique unicast IPv6 addresses are handled by the Internet   Numbers Registry System in accordance with policies developed by the   RIRs in accordance with their processes.   Reservations of special-purpose IPv6 addresses can be found in the   IANA registry [IANA-IPv6-Reg].  Future additions to this registry can   be made through "IETF Review" as defined in [RFC5226].  Once a   reservation is approved, it is recorded in the special-purpose IPv6   address registry with a reference to the IESG-approved RFC that   documents the reservation.Housley                       Informational                     [Page 3]

RFC 7249               Internet Numbers Registries              May 20143.  IANA Considerations   IANA has created the "Special-Purpose AS Numbers" registry.  Future   additions to this registry can be made through "IETF Review" as   defined in [RFC5226].  At this time, the special-purpose AS numbers   are:   AS Numbers             Reason for Reservation   ---------------------  -------------------------------------------   0                      Reserved by [AS0-PROCESS]   23456                  AS_TRANS; reserved by [RFC6793]   64496-64511            For documentation and sample code; reserved                            by [RFC5398]   64512-65534            For private use; reserved by [RFC6996]   65535                  Reserved by [RFC1930]   65536-65551            For documentation and sample code; reserved                            by [RFC5398]   4200000000-4294967294  For private use; reserved by [RFC6996]   4294967295             Reserved by [LAST-AS-RES]4.  Security Considerations   This document identifies the IANA registries that are part of the   Internet Numbers Registry System at the time of publication.  It does   not change the security posture of the Internet in any way.   Network operators should take care that special-purpose numbers and   addresses are used on the public Internet in a manner that is   consistent with their reserved purpose.5.  References5.1.  Normative References   [RFC2860] Carpenter, B., Baker, F., and M. Roberts, "Memorandum of             Understanding Concerning the Technical Work of the Internet             Assigned Numbers Authority",RFC 2860, June 2000.   [RFC5226] Narten, T. and H. Alvestrand, "Guidelines for Writing an             IANA Considerations Section in RFCs",BCP 26,RFC 5226, May             2008.   [RFC7020] Housley, R., Curran, J., Huston, G., and D. Conrad, "The             Internet Numbers Registry System",RFC 7020, August 2013.Housley                       Informational                     [Page 4]

RFC 7249               Internet Numbers Registries              May 20145.2.  Informative References   [AS0-PROCESS]             Kumari, W., Bush, R., Schiller, H., and K. Patel,             "Codification of AS 0 processing", Work in Progress, August             2012.   [IANA-IPv4-Reg]             IANA, "IANA IPv4 Special-Purpose Address Registry",             <http://www.iana.org/assignments/iana-ipv4-special-registry>.   [IANA-IPv6-Reg]             IANA, "IANA IPv6 Special-Purpose Address Registry",             <http://www.iana.org/assignments/iana-ipv6-special-registry>.   [LAST-AS-RES]             Haas, J. and J. Mitchell, "Reservation of Last Autonomous             System (AS) Numbers", Work in Progress, April 2014.   [RFC1930] Hawkinson, J. and T. Bates, "Guidelines for creation,             selection, and registration of an Autonomous System (AS)",BCP 6,RFC 1930, March 1996.   [RFC4291] Hinden, R. and S. Deering, "IP Version 6 Addressing             Architecture",RFC 4291, February 2006.   [RFC5398] Huston, G., "Autonomous System (AS) Number Reservation for             Documentation Use",RFC 5398, December 2008.   [RFC6793] Vohra, Q. and E. Chen, "BGP Support for Four-Octet             Autonomous System (AS) Number Space",RFC 6793, December             2012.   [RFC6996] Mitchell, J., "Autonomous System (AS) Reservation for             Private Use",BCP 6,RFC 6996, July 2013.Acknowledgements   Many thanks to Jari Arkko, Scott Bradner, Brian Carpenter, David   Conrad, John Curran, David Farmer, Adrian Farrel, Stephen Farrell,   Brian Haberman, Geoff Huston, George Michaelson, S. Moonesamy, and   Thomas Narten for their insightful review and comment.Housley                       Informational                     [Page 5]

RFC 7249               Internet Numbers Registries              May 2014Author's Address   Russell Housley   Vigil Security, LLC   918 Spring Knoll Drive   Herndon, VA 20170   USA   EMail: housley@vigilsec.comHousley                       Informational                     [Page 6]