INFORMATIONAL

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/rfc5737. 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]

RFC 5737 IPv4 Examples January 2010 1 . Introduction RFC1166] 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 [RFC3849] and example domain names [RFC2606]. Documentation also makes use of the ranges reserved in [RFC1918]. 2 . Terminology BCP 14, [RFC2119]. 3 . Documentation Address Blocks 4 . Operational Implications RFC2050]. 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]

RFC 5737 IPv4 Examples January 2010 Appendix A . Acknowledgments RFC3849]. 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]