The RFC Archive
 The RFC Archive   RFC 5737   « Jump to any RFC number directly 
 RFC Home
Full RFC Index
Recent RFCs
RFC Standards
Best Current Practice
RFC Errata
1 April RFC



IETF RFC 5737

IPv4 Address Blocks Reserved for Documentation

Last modified on Thursday, January 7th, 2010

Permanent link to RFC 5737
Search GitHub Wiki for RFC 5737
Show other RFCs mentioning RFC 5737







Internet Engineering Task Force (IETF)                          J. Arkko
Request for Comments: 5737                                      Ericsson
Updates: 1166                                                  M. Cotton
Category: Informational                                      L. Vegoda
ISSN: 2070-1721                                                    ICANN
                                                            January 2010


             IPv4 Address Blocks Reserved for Documentation

 Abstract

   Three IPv4 unicast address blocks are reserved for use in examples in
   specifications and other documents.  This document describes the use
   of these blocks.

 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 5737.

 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.





Arkko, et al.                Informational                   PAGE 1 top


RFC 5737 IPv4 Examples January 2010 1. Introduction This document describes three IPv4 address blocks that are provided for use in documentation. The use of designated address ranges for documentation and examples reduces the likelihood of conflicts and confusion arising from the use of addresses assigned for some other purpose. [RFC 1166] reserves the first of the three address blocks, 192.0.2.0/24. The other two address blocks have recently been allocated for this purpose, primarily to ease the writing of examples involving addresses from multiple networks. Other documentation ranges have been defined in the IETF, including the IPv6 documentation prefix [RFC 3849] and example domain names [RFC 2606]. Documentation also makes use of the ranges reserved in [RFC 1918]. 2. Terminology The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14, [RFC 2119]. 3. Documentation Address Blocks The blocks 192.0.2.0/24 (TEST-NET-1), 198.51.100.0/24 (TEST-NET-2), and 203.0.113.0/24 (TEST-NET-3) are provided for use in documentation. 4. Operational Implications Addresses within the TEST-NET-1, TEST-NET-2, and TEST-NET-3 blocks SHOULD NOT appear on the public Internet and are used without any coordination with IANA or an Internet registry [RFC 2050]. Network operators SHOULD add these address blocks to the list of non- routeable address spaces, and if packet filters are deployed, then this address block SHOULD be added to packet filters. These blocks are not for local use, and the filters may be used in both local and public contexts. Arkko, et al. Informational PAGE 2 top

RFC 5737 IPv4 Examples January 2010 5. The Status of 128.66.0.0/16 Note that 128.66.0.0/16 has been used for some examples in the past. However, this block did not appear in the list of special prefixes in [RFC 3330] or its successors, and the block is therefore not reserved for any special purpose. The block can be used for regular address assignments with caution. 6. Security Considerations This document has no security implications. 7. IANA Considerations IANA has recorded the allocation of the three address blocks in the IPv4 address registry. No end party is to be assigned these addresses. 8. References 8.1. Normative References [RFC 2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. 8.2. Informative References [RFC 1166] Kirkpatrick, S., Stahl, M., and M. Recker, "Internet numbers", RFC 1166, July 1990. [RFC 1918] Rekhter, Y., Moskowitz, R., Karrenberg, D., Groot, G., and E. Lear, "Address Allocation for Private Internets", BCP 5, RFC 1918, February 1996. [RFC 2050] Hubbard, K., Kosters, M., Conrad, D., Karrenberg, D., and J. Postel, "INTERNET REGISTRY IP ALLOCATION GUIDELINES", BCP 12, RFC 2050, November 1996. [RFC 2606] Eastlake, D. and A. Panitz, "Reserved Top Level DNS Names", BCP 32, RFC 2606, June 1999. [RFC 3330] IANA, "Special-Use IPv4 Addresses", RFC 3330, September 2002. [RFC 3849] Huston, G., Lord, A., and P. Smith, "IPv6 Address Prefix Reserved for Documentation", RFC 3849, July 2004. Arkko, et al. Informational PAGE 3 top

RFC 5737 IPv4 Examples January 2010 Appendix A. Acknowledgments The authors would like to offer a special note of thanks to APNIC, which nominated 198.51.100.0/24 and 203.0.113.0/24 for this purpose. The authors would also like to acknowledge that this document inherits material from [RFC 3849]. The authors would also like to thank Geoff Huston, Peter Koch, Ulf Olsson, John Klensin, and others for interesting discussions of this topic. Authors' Addresses Jari Arkko Ericsson Jorvas 02420 Finland EMail: jari.arkko@piuha.net Michelle Cotton Internet Corporation for Assigned Names and Numbers 4676 Admiralty Way, Suite 330 Marina del Rey 90292 United States of America 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 90292 United States of America Phone: +1-310-823-9358 EMail: leo.vegoda@icann.org URI: http://www.iana.org/ Arkko, et al. Informational PAGE 4 top

IPv4 Address Blocks Reserved for Documentation RFC TOTAL SIZE: 7036 bytes PUBLICATION DATE: Thursday, January 7th, 2010 LEGAL RIGHTS: The IETF Trust (see BCP 78)


RFC-ARCHIVE.ORG

© RFC 5737: The IETF Trust, Thursday, January 7th, 2010
© the RFC Archive, 2024, RFC-Archive.org
Maintainer: J. Tunnissen

Privacy Statement