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
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.
Copyright (c) 2010 IETF Trust and the persons identified as the document authors. All rights reserved.
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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.
[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].
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, [RFC2119].
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 [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.
Note that 188.8.131.52/16 has been used for some examples in the past. However, this block did not appear in the list of special prefixes in [RFC3330] 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.
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 [RFC3849].
The authors would also like to thank Geoff Huston, Peter Koch, Ulf Olsson, John Klensin, and others for interesting discussions of this topic.
Jari Arkko Ericsson Jorvas 02420 Finland
Michelle Cotton Internet Corporation for Assigned Names and Numbers 4676 Admiralty Way, Suite 330 Marina del Rey 90292 United States of America