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IANA IPv4 Special-Purpose Address Registry; IANA IPv6 Special-Purpose Address Registry This page was last edited on 26 January 2025, at 04:36 (UTC). Text is available ...
Some large / 8 blocks of IPv4 addresses, the former Class A network blocks, are assigned in whole to single organizations or related groups of organizations, either by the Internet Corporation for Assigned Names and Numbers (ICANN), through the Internet Assigned Numbers Authority (IANA), or a regional Internet registry.
Instead, an address in the 100.64.0.0 / 10 range is assigned on the CPE's Internet-facing interface, and this address is translated again to one of the public IPv4 addresses of the ISP's core routers. Using shared address space allows ISPs to continue to use IPv4 as they were used to.
In the case of the two major Internet namespaces, namely IP addresses and domain names, extra administrative policy and delegation to subordinate administrations is required because of the multi-layered distributed use of these resources. IANA is responsible for assignment of Internet numbers, [5] [6] which are numerical identifiers assigned to ...
IANA assigns blocks of IP addresses to the RIRs, ... Address block 169.254.0.0 / 16 is defined for the special use of link-local addressing for IPv4 networks. [14]
Decomposition of the quad-dotted IPv4 address representation to its binary value. IPv4 uses 32-bit addresses which limits the address space to 4 294 967 296 (2 32) addresses. IPv4 reserves special address blocks for private networks (2 24 + 2 20 + 2 16 ≈ 18 million addresses) and multicast addresses (2 28 ≈ 268 million addresses).
This is a list of countries by IPv4 address allocation. The Internet Assigned Numbers Authority (IANA) distributes large blocks of addresses to regional Internet registries (RIRs), which then assign them to national Internet registries and local Internet registries within their respective service regions. [1]
RFC 2663 – IP Network Address Translator (NAT) Terminology and Considerations; RFC 3022 – Traditional IP Network Address Translator (Traditional NAT) RFC 3330 – Special-Use IPv4 Addresses (superseded) RFC 3879 – Deprecating Site Local Addresses; RFC 3927 – Dynamic Configuration of IPv4 Link-Local Addresses