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This means that 256 /8 address blocks fit into the entire IPv4 space. As IPv4 address exhaustion has advanced to its final stages, some organizations, such as Stanford University, formerly using 36.0.0.0 / 8, have returned their allocated blocks (in this case to APNIC) to assist in the delay of the exhaustion date.
If an ISP deploys a CGN and uses private Internet address space [2] (networks 10.0.0.0 / 8, 172.16.0.0 / 12, 192.168.0.0 / 16) to connect their customers, there is a risk that customer equipment using an internal network in the same range will stop working.
On 18 July 2019, there was a sale of 44.192.0.0 / 10 delete address space to Amazon Technologies Inc, which was the highest bidder, [49] for use by Amazon Web Services. [54] AMPRNet subsequently consisted of 44.0 / 9 delete, and 44.128 / 10 delete, [ 55 ] with no plans to sell any more address space.
Some address space previously reserved by IANA has been added to the available pool. There have been proposals to use the class E network range of IPv4 addresses [76] [77] (which would add 268.4 million IP addresses to the available pool) but many computer and router operating systems and firmware do not allow the use of these addresses.
Shared address space [4] for communications between a service provider and its subscribers when using a carrier-grade NAT 127.0.0.0/8 127.0.0.0–127.255.255.255
ARIN manages the distribution of Internet number resources, including IPv4 and IPv6 address space and AS numbers. ARIN opened for business on December 22, 1997 [1] after incorporating on April 18, 1997. [2] ARIN is a nonprofit corporation with headquarters in Chantilly, Virginia, United States. [3] [4]
An IPv4 address has a size of 32 bits, which limits the address space to 4 294 967 296 (2 32) addresses. Of this number, some addresses are reserved for special purposes such as private networks (≈18 million addresses) and multicast addressing (≈270 million 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RFC 3330 – Special-Use IPv4 Addresses (superseded) RFC 3879 – Deprecating Site Local Addresses; RFC 3927 – Dynamic Configuration of IPv4 Link-Local Addresses; RFC 4193 – Unique Local IPv6 Unicast Addresses; RFC 5735 – Special-Use IPv4 Addresses (superseded) RFC 6598 – Reserved IPv4 Prefix for Shared Address Space