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Versions: (RFC 3330) 00 01 02 03 04 05 06 07 08 09 10 11 RFC 5735

Network Working Group                                          M. Cotton
Internet-Draft                                                     ICANN
Intended status: Best Current                           February 6, 2008
Practice
Expires: August 9, 2008


                       Special Use IPv4 Addresses
                        draft-iana-rfc3330bis-00

Status of this Memo

   By submitting this Internet-Draft, each author represents that any
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   This Internet-Draft will expire on August 9, 2008.

Copyright Notice

   Copyright (C) The IETF Trust (2008).

Abstract

   This document describes the global and other specialized IPv4 address
   blocks that have been assigned by the Internet Assigned Numbers
   Authority (IANA).  It does not address IPv4 address space assigned to
   operators and users through the Regional Internet Registries.  It
   also does not address allocations or assignments of IPv6 addresses or
   autonomous system numbers.




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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . 3
   3.  Global and Other Specialized Address Blocks . . . . . . . . . . 3
   4.  Summary Table . . . . . . . . . . . . . . . . . . . . . . . . . 6
   5.  Assignments of IPv4 Blocks for New Specialized Uses . . . . . . 6
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 7
   7.  Security Considerations . . . . . . . . . . . . . . . . . . . . 7
   8.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 7
   9.  Informative References  . . . . . . . . . . . . . . . . . . . . 7
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . . . 8
   Intellectual Property and Copyright Statements  . . . . . . . . . . 9






































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1.  Introduction

   Throughout its entire history, the Internet has employed a central
   Internet Assigned Numbers Authority (IANA) responsible for the
   allocation and assignment of various identifiers needed for the
   operation of the Internet [[RFC1174]].  In the case of the IPv4
   address space, the IANA allocates parts of the address space to
   Regional Internet Registries according to their established needs.
   These Regional Internet Registries are responsible for the assignment
   of IPv4 addresses to operators and users of the Internet within their
   regions.

   Minor portions of the IPv4 address space have been allocated or
   assigned directly by the IANA for global or other specialized
   purposes.  These allocations and assignments have been documented in
   a variety of RFCs and other documents.  This document is intended to
   collect these scattered references.

   On an ongoing basis, the IANA has been designated by the IETF to make
   assignments in support of the Internet Standards Process [[RFC2860]].
   Section 4 of this document describes that assignment process.

   The terms "Specification Required", "Expert Review", "IESG Approval",
   "IETF Consensus", and "Standards Action", are used in this memo to
   refer to the processes described in [RFC2434].  The keywords MUST,
   MUST NOT, MAY, OPTIONAL, REQUIRED, RECOMMENDED, SHALL, SHALL NOT,
   SHOULD, SHOULD NOT are to be interpreted as defined in [RFC2119].


2.  Terminology

   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.  Global and Other Specialized Address Blocks

   0.0.0.0/8 - Addresses in this block refer to source hosts on "this"
   network.  Address 0.0.0.0/32 may be used as a source address for this
   host on this network; other addresses within 0.0.0.0/8 may be used to
   refer to specified hosts on this network [[RFC1700], page 4].

   10.0.0.0/8 - This block is set aside for use in private networks.
   Its intended use is documented in [[RFC1918]].  Addresses within this
   block should not appear on the public Internet.

   14.0.0.0/8 - This block was set aside for assignments to the



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   international system of Public Data Networks [[RFC1700], page 181].
   All the assignments made for this purpose were reclaimed by the IANA
   And this block therefore no longer has a special use and is subject
   to allocation to a Regional Internet Registry for assignment in the
   normal manner.

   24.0.0.0/8 - This block was allocated in early 1996 for use in
   provisioning IP service over cable television systems.  Although the
   IANA initially was involved in making assignments to cable operators,
   this responsibility was transferred to American Registry for Internet
   Numbers (ARIN) in May 2001.  Addresses within this block are assigned
   in the normal manner and should be treated as such.

   39.0.0.0/8 - This block was used in the "Class A Subnet Experiment"
   that commenced in May 1995, as documented in [[RFC1797]].  The
   experiment has been completed and this block has been returned to the
   pool of addresses reserved for future allocation or assignment.  This
   block therefore no longer has a special use and is subject to
   allocation to a Regional Internet Registry for assignment in the
   normal manner.

   127.0.0.0/8 - This block is assigned for use as the Internet host
   loopback address.  A datagram sent by a higher level protocol to an
   address anywhere within this block should loop back inside the host.
   This is ordinarily implemented using only 127.0.0.1/32 for loopback,
   but no addresses within this block should ever appear on any network
   anywhere [[RFC1700], page 5].

   128.0.0.0/16 - This block, corresponding to the numerically lowest of
   the former Class B addresses, was initially reserved by the IANA.
   Given the present classless nature of the IP address space, the basis
   for the reservation no longer applies and addresses in this block are
   subject to future allocation by a Regional Internet Registry for
   assignment in the normal manner.

   169.254.0.0/16 - This is the "link local" block.  It is allocated for
   communication between hosts on a single link.  Hosts obtain these
   addresses by auto-configuration, such as when a DHCP server may not
   be found.

   172.16.0.0/12 - This block is set aside for use in private networks.
   Its intended use is documented in [[RFC1918]].  Addresses within this
   block should not appear on the public Internet.

   191.255.0.0/16 - This block, corresponding to the numerically highest
   to the former Class B addresses, was initially reserved by the IANA.
   Given the present classless nature of the IP address space, the basis
   for the reservation no longer applies and addresses in this block are



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   subject to future allocation by a Regional Internet Registry for
   assignment in the normal manner.

   192.0.0.0/24 - This block, corresponding to the numerically lowest of
   the former Class C addresses, was initially reserved by the IANA.
   Given the present classless nature of the IP address space, the basis
   for the reservation no longer applies and addresses in this block are
   subject to future allocation by a Regional Internet Registry for
   assignment in the normal manner.

   192.0.2.0/24 - This block is assigned as "TEST-NET" for use in
   documentation and example code.  It is often used in conjunction with
   domain names example.com or example.net in vendor and protocol
   documentation.  Addresses within this block should not appear on the
   public Internet.

   192.88.99.0/24 - This block is allocated for use as 6to4 relay
   anycast addresses, according to [[RFC3068]].

   192.168.0.0/16 - This block is set aside for use in private networks.
   Its intended use is documented in [[RFC1918]].  Addresses within this
   block should not appear on the public Internet.

   198.18.0.0/15 - This block has been allocated for use in benchmark
   tests of network interconnect devices.  Its use is documented in
   [[RFC2544]].

   223.255.255.0/24 - This block, corresponding to the numerically
   highest of the former Class C addresses, was initially reserved by
   the IANA.  Given the present classless nature of the IP address
   space, the basis for the reservation no longer applies and addresses
   in this block are subject to future allocation to a Regional Internet
   Registry for assignment in the normal manner.

   224.0.0.0/4 - This block, formerly known as the Class D address
   space, is allocated for use in IPv4 multicast address assignments.
   The IANA guidelines for assignments from this space are described in
   [[RFC3171]].

   240.0.0.0/4 - This block, formerly known as the Class E address
   space, is reserved.  The "limited broadcast" destination address
   255.255.255.255 should never be forwarded outside the (sub-)net of
   the source.  The remainder of this space is reserved for future use.
   [[RFC1700], page 4]







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4.  Summary Table


   Address Block       Present Use                Reference
   ------------------------------------------------------------------
   0.0.0.0/8           "This" Network             RFC1700, page 4
   10.0.0.0/8          Private-Use Networks       RFC1918
   14.0.0.0/8          Subject to allocation
   24.0.0.0/8          Cable Television Networks
   39.0.0.0/8          Subject to allocation
   127.0.0.0/8         Loopback                   RFC1700, page 5
   128.0.0.0/16        Subject to assignment
   169.254.0.0/16      Link Local                  --
   172.16.0.0/12       Private-Use Networks       RFC1918
   191.255.0.0/16      Subject to allocation       --
   192.0.0.0/24        Subject to allocation       --
   192.0.2.0/24        Test-Net
   192.88.99.0/24      6to4 Relay Anycast         RFC3068
   192.168.0.0/16      Private-Use Networks       RFC1918
   198.18.0.0/15       Network Interconnect
                       Device Benchmark Testing   RFC2544
   223.255.255.0/24    Subject to allocation       --
   224.0.0.0/4         Multicast                  RFC3171
   240.0.0.0/4         Reserved for Future Use    RFC1700, page 4




5.  Assignments of IPv4 Blocks for New Specialized Uses

   The IANA has responsibility for making assignments of protocol
   parameters used in the Internet according to the requirements of the
   "Memorandum of Understanding Concerning the Technical Work of the
   Internet Assigned Numbers Authority" [[RFC2860]].  Among other
   things, [[RFC2860]] requires that protocol parameters be assigned
   according to the criteria and procedures specified in RFCs, including
   Proposed, Draft, and full Internet Standards and Best Current
   Practice documents, and any other RFC that calls for IANA assignment.

   The domain name and IP address spaces involve policy issues (in
   addition to technical issues) so that the requirements of [[RFC2860]]
   do not apply generally to those spaces.  Nonetheless, the IANA is
   responsible for ensuring assignments of IPv4 addresses as needed in
   support of the Internet Standards Process.  When a portion of the
   IPv4 address space is specifically required by an RFC, the technical
   requirements (e.g., size, prefix length) for the portion should be
   described [[RFC2434]].  Immediately before the RFC is published, the
   IANA will, in consultation with the Regional Internet Registries,



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   make the necessary assignment and notify the RFC Editor of the
   particulars for inclusion in the RFC as published.

   As required by [[RFC2860]], the IANA will also make necessary
   experimental assignments of IPv4 addresses, also in consultation with
   the Regional Internet Registries.


6.  IANA Considerations

   This document describes the IANA's past and current practices and
   does not create any new requirements for assignments or allocations
   by the IANA.


7.  Security Considerations

   The particular assigned values of special-use IPv4 addresses
   cataloged in this document do not directly raise security issues.
   However, the Internet does not inherently protect against abuse of
   these addresses; if you expect (for instance) that all packets from
   the 10.0.0.0/8 block originate within your subnet, all border routers
   should filter such packets that originate from elsewhere.  Attacks
   have been mounted that depend on the unexpected use of some of these
   addresses.


8.  Acknowledgments

   Many people have made comments on draft versions of this document.
   The IANA would especially like to thank Scott Bradner, Randy Bush,
   Leo Vegoda, and Harald Alvestrand for their constructive feedback and
   comments.


9.  Informative References

   [RFC1174]  Cerf, V., "IAB recommended policy on distributing internet
              identifier assignment and IAB recommended policy change to
              internet "connected" status", RFC 1174, August 1990.

   [RFC1700]  Reynolds, J. and J. Postel, "Assigned Numbers", RFC 1700,
              October 1994.

   [RFC1797]  Internet Assigned Numbers Authority (IANA), "Class A
              Subnet Experiment", RFC 1797, April 1995.

   [RFC1918]  Rekhter, Y., Moskowitz, R., Karrenberg, D., Groot, G., and



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              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.

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

   [RFC2434]  Narten, T. and H. Alvestrand, "Guidelines for Writing an
              IANA Considerations Section in RFCs", BCP 26, RFC 2434,
              October 1998.

   [RFC2544]  Bradner, S. and J. McQuaid, "Benchmarking Methodology for
              Network Interconnect Devices", RFC 2544, March 1999.

   [RFC2860]  Carpenter, B., Baker, F., and M. Roberts, "Memorandum of
              Understanding Concerning the Technical Work of the
              Internet Assigned Numbers Authority", RFC 2860, June 2000.

   [RFC3068]  Huitema, C., "An Anycast Prefix for 6to4 Relay Routers",
              RFC 3068, June 2001.

   [RFC3171]  Albanna, Z., Almeroth, K., Meyer, D., and M. Schipper,
              "IANA Guidelines for IPv4 Multicast Address Assignments",
              BCP 51, RFC 3171, August 2001.

   [RFC3232]  Reynolds, J., "Assigned Numbers: RFC 1700 is Replaced by
              an On-line Database", RFC 3232, January 2002.


Author's Address

   Michelle Cotton
   Internet Corporation for Assigned Names and Numbers
   4676 Admiralty Way, Suite 330
   Marina del Rey  90292
   United States

   Phone: +310-823-9358
   Email: michelle.cotton@icann.org
   URI:   http://www.iana.org/








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Full Copyright Statement

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Acknowledgment

   Funding for the RFC Editor function is provided by the IETF
   Administrative Support Activity (IASA).





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