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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 of using unique addresses from the rapidly depleting pool of available globally unique IPv4 addresses, ISPs use addresses in 100.64.0.0 / 10 for this purpose. Because the network between CPEs and the ISP's routers is private to each ISP, all ISPs may share this block of addresses.
RFC 3330 – Special-Use IPv4 Addresses (superseded) RFC 3879 – Deprecating Site Local Addresses; RFC 3927 – Dynamic Configuration of IPv4 Link-Local Addresses; RFC 4193 – Unique Local IPv6 Unicast Addresses; RFC 5735 – Special-Use IPv4 Addresses (superseded) RFC 6598 – Reserved IPv4 Prefix for Shared Address Space
Specify lists of address ranges, e.g. in CIDR format, for various address families. Experimental. SINK 40 — Defined by the Kitchen Sink Internet Draft, but never made it to RFC status GPOS 27 RFC 1712 A more limited early version of the LOC record UINFO 100 — IANA reserved, no RFC documented them and support was removed from BIND in the ...
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 the IP protocol numbers found in the field Protocol of the IPv4 header and the Next Header field of the IPv6 header.It is an identifier for the encapsulated protocol and determines the layout of the data that immediately follows the header.
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 ...