Request for Comments: 5737
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.
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 © 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].
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 [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.
5. The Status of 220.127.116.11/16
Note that 18.104.22.168/16 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.
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.
8.1. Normative References
8.2. Informative References
[RFC1166] Kirkpatrick, S., Stahl, M., and M. Recker, "Internet numbers", RFC 1166, July 1990. [RFC1918] Rekhter, Y., Moskowitz, R., Karrenberg, D., Groot, G., and E. Lear, "Address Allocation for Private Internets", BCP 5, RFC 1918, February 1996. [RFC2050] Hubbard, K., Kosters, M., Conrad, D., Karrenberg, D., and J. Postel, "INTERNET REGISTRY IP ALLOCATION GUIDELINES", BCP 12, RFC 2050, November 1996. [RFC2606] Eastlake, D. and A. Panitz, "Reserved Top Level DNS Names", BCP 32, RFC 2606, June 1999. [RFC3330] IANA, "Special-Use IPv4 Addresses", RFC 3330, September 2002. [RFC3849] Huston, G., Lord, A., and P. Smith, "IPv6 Address Prefix Reserved for Documentation", RFC 3849, July 2004.
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 [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 EMail: firstname.lastname@example.org 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: email@example.com 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: firstname.lastname@example.org URI: http://www.iana.org/