IPv4 Address Blocks Reserved for Documentation
Ericsson
Jorvas 02420
Finland
jari.arkko@piuha.net
Internet Corporation for Assigned Names and Numbers
4676 Admiralty Way, Suite 330
90292
Marina del Rey
United States of America
+310-823-9358
michelle.cotton@icann.org
http://www.iana.org/
Internet Corporation for Assigned Names and Numbers
4676 Admiralty Way, Suite 330
90292
Marina del Rey
United States of America
+310-823-9358
leo.vegoda@icann.org
http://www.iana.org/
example addresses
IPv4
Three IPv4 unicast address blocks are reserved for use in examples
in specifications and other documents. This document describes the
use of these blocks.
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.
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 and example
domain names . Documentation also makes use
of the ranges reserved in .
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, .
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.
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
. Network operators SHOULD add these
address blocks to the list of non-routeable address space, 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 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 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.
This document has no security implications.
IANA should record the allocation of the three address blocks in
the IPv4 address registry. No end party is to be assigned these
addresses.
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 .
The authors would also like to thank Geoff Huston, Peter Koch, Ulf
Olsson, John Klensin and others for interesting discussions of this topic.