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Network Working Group Request for Comments: 3330 Category: Informational |
IANA September 2002 |
This memo provides information for the Internet community. It does not specify an Internet standard of any kind. Distribution of this memo is unlimited.
Copyright © The Internet Society (2002). All Rights Reserved.
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.
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.
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 Public-Data Networks [RFC1700, page 181]
24.0.0.0/8 Cable Television Networks --
39.0.0.0/8 Reserved but subject
to allocation [RFC1797]
127.0.0.0/8 Loopback [RFC1700, page 5]
128.0.0.0/16 Reserved but subject
to allocation --
169.254.0.0/16 Link Local --
172.16.0.0/12 Private-Use Networks [RFC1918]
191.255.0.0/16 Reserved but subject
to allocation --
192.0.0.0/24 Reserved but 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 Reserved but subject
to allocation --
224.0.0.0/4 Multicast [RFC3171]
240.0.0.0/4 Reserved for Future Use [RFC1700, page 4]
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, 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.
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.
This document describes the IANA's past and current practices and does not create any new requirements for assignments or allocations by the IANA.
[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", STD 2, RFC 1700, October 1994.
[RFC1797] IANA, "Class A Subnet Experiment", RFC 1797, April 1995.
[RFC1918] Rekhter, Y., Moskowitz, B., Karrenberg, D., de Groot, G. J., 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.
[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. Ed., "Assigned Numbers: RFC 1700 is Replaced by an On-line Database", RFC 3232, January 2002.
Many people have made comments on draft versions of this document. The IANA would especially like to thank Scott Bradner, Randy Bush, and Harald Alvestrand for their constructive feedback and comments.
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