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
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.

本文件是互联网工程任务组(IETF)的产品。它代表了IETF社区的共识。它已经接受了公众审查,并已被互联网工程指导小组(IESG)批准出版。并非IESG批准的所有文件都适用于任何级别的互联网标准;见RFC 5741第2节。

Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at


Copyright Notice


Copyright (c) 2010 IETF Trust and the persons identified as the document authors. All rights reserved.

版权所有(c)2010 IETF信托基金和确定为文件作者的人员。版权所有。

This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents ( 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.

本文件受BCP 78和IETF信托有关IETF文件的法律规定的约束(自本文件出版之日起生效。请仔细阅读这些文件,因为它们描述了您对本文件的权利和限制。从本文件中提取的代码组件必须包括信托法律条款第4.e节中所述的简化BSD许可证文本,并提供简化BSD许可证中所述的无担保。

1. Introduction
1. 介绍

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, 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
2. 术语

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].

本文件中的关键词“必须”、“不得”、“要求”、“应”、“不应”、“应”、“不应”、“建议”、“可”和“可选”应按照BCP 14、[RFC2119]中所述进行解释。

3. Documentation Address Blocks
3. 文档地址块

The blocks (TEST-NET-1), (TEST-NET-2), and (TEST-NET-3) are provided for use in documentation.


4. Operational Implications
4. 业务影响

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

Note that 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
6. 安全考虑

This document has no security implications.


7. IANA Considerations
7. IANA考虑

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. 工具书类
8.1. Normative References
8.1. 规范性引用文件

[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997.

[RFC2119]Bradner,S.,“RFC中用于表示需求水平的关键词”,BCP 14,RFC 2119,1997年3月。

8.2. Informative References
8.2. 资料性引用

[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.

[RFC1918]Rekhter,Y.,Moskowitz,R.,Karrenberg,D.,Groot,G.,和E.Lear,“私人互联网地址分配”,BCP 5,RFC 1918,1996年2月。

[RFC2050] Hubbard, K., Kosters, M., Conrad, D., Karrenberg, D., and J. Postel, "INTERNET REGISTRY IP ALLOCATION GUIDELINES", BCP 12, RFC 2050, November 1996.

[RFC2050]哈伯德,K.,科斯特斯,M.,康拉德,D.,卡伦伯格,D.,和J.波斯特尔,“互联网注册IP分配指南”,BCP 12,RFC 2050,1996年11月。

[RFC2606] Eastlake, D. and A. Panitz, "Reserved Top Level DNS Names", BCP 32, RFC 2606, June 1999.

[RFC2606]Eastlake,D.和A.Panitz,“保留顶级DNS名称”,BCP 32,RFC 26061999年6月。

[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.

[RFC3849]Huston,G.,Lord,A.,和P.Smith,“为文档保留IPv6地址前缀”,RFC 3849,2004年7月。

Appendix A. Acknowledgments

The authors would like to offer a special note of thanks to APNIC, which nominated and 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.


Authors' Addresses


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

Michelle Cotton互联网公司,美国海军部路4676号,330室,Marina del Rey 90292

   Phone: +1-310-823-9358
   Phone: +1-310-823-9358

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
   Phone: +1-310-823-9358