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The original list of IPv4 address blocks was published in September 1981. [3] In previous versions of the document, [19] [20] network numbers were 8-bit numbers rather than the 32-bit numbers used in IPv4. At that time, three networks were added that were not listed earlier: 42.rrr.rrr.rrr, 43.rrr.rrr.rrr, and 44.rrr.rrr.rrr.
Special address blocks Address block Address range Number of addresses Scope Description 0.0.0.0/8 0.0.0.0–0.255.255.255 16 777 216: Software Current (local, "this") network [1]
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 ]
Address block 169.254.0.0 / 16 is defined for the special use of link-local addressing for IPv4 networks. [14] In IPv6, every interface, whether using static or dynamic addresses, also receives a link-local address automatically in the block fe80:: / 10 . [ 14 ]
The address block fc00:: / 7 is reserved by IANA for unique local addresses (ULAs). [2] They are unicast addresses, but contain a 40-bit random number in the routing prefix to prevent collisions when two private networks are interconnected. Despite being inherently local in usage, the IPv6 address scope of unique local addresses is global. The ...
The RIRs divide their allocated address pools into smaller blocks and delegate them to Internet service providers and other organizations in their operating regions. [9] Since the introduction of the CIDR system, IANA has typically allocated address space in the size of /8 prefix blocks for IPv4 and /23 to/12 prefix blocks from the 2000::/3 ...
A multicast address is a logical identifier for a group of hosts in a computer ... The IEEE has allocated the address block 01-80-C2-00-00-00 to 01-80-C2-FF-FF-FF ...
The primary address pool of the Internet, maintained by IANA, was exhausted on 3 February 2011, when the last five blocks were allocated to the five RIRs. [ 26 ] [ 27 ] APNIC was the first RIR to exhaust its regional pool on 15 April 2011, except for a small amount of address space reserved for the transition technologies to IPv6, which is to ...