An IPv4 network, shared by ISPs, to connect CPEs with the ISP's routers.
In order to ensure proper working of carrier-grade NAT (CGN), and, by doing so, alleviating the demand for the last remaining IPv4 addresses, a /10 size IPv4 address block was assigned by Internet Assigned Numbers Authority (IANA) to be used as shared address space.[1]
This block of addresses is specifically meant to be used by Internet service providers (or ISPs) that implement carrier-grade NAT, to connect their customer-premises equipment (CPE) to their core routers.
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.
^M. Cotton; L. Vegoda; B. Haberman (April 2013). R. Bonica (ed.). Special-Purpose IP Address Registries. IETF. doi:10.17487/RFC6890. ISSN 2070-1721. BCP 153. RFC 6890. Best Common Practice. Obsoletes RFC 4773, 5156, 5735 and 5736. Updated by RFC 8190.
and 26 Related for: IPv4 shared address space information
remaining IPv4addresses, a /10 size IPv4address block was assigned by Internet Assigned Numbers Authority (IANA) to be used as sharedaddressspace. This...
IPv4address exhaustion is the depletion of the pool of unallocated IPv4addresses. Because the original Internet architecture had fewer than 4.3 billion...
Private IP addressspaces were originally defined to assist in delaying IPv4address exhaustion. IP packets originating from or addressed to a private...
version 6 (IPv6), its successor. IPv4 uses a 32-bit addressspace which provides 4,294,967,296 (232) unique addresses, but large blocks are reserved for...
as a MAC address, associated with a given internet layer address, typically an IPv4address. This mapping is a critical function in the Internet protocol...
the IP address indicate the network and subnet. An IPv4address has a size of 32 bits, which limits the addressspace to 4294967296 (232) addresses. Of this...
C. Liljenstolpe; M. Azinger (April 2012). IANA-Reserved IPv4 Prefix for SharedAddressSpace. Internet Engineering Task Force. doi:10.17487/RFC6598. ISSN 2070-1721...
1990s, it became evident that far more addresses would be needed to connect devices than the IPv4addressspace had available. By 1998, the IETF had formalized...
of an interface corresponding to an IP address may be queried with the Address Resolution Protocol (ARP) for IPv4 and the Neighbor Discovery Protocol (NDP)...
range of global IPv4 multicast addressspace provided to each organization that has /24 or larger globally routed unicast addressspace allocated; one...
using the same addressspace, especially the IPv4 private addressspace. The provider must be able to disambiguate overlapping addresses in the multiple...
Bigger Addresses, RFC 1347). Its most prominent difference from version 4 is the size of the addresses. While IPv4 uses 32 bits for addressing, yielding...
Since the exhaustion of the Internet Protocol Version 4 addressspace, no further IPv4addressspace is allocated by IANA. IANA administers the data in the...
Internet protocol suite and 44/8 IPv4addresses followed subsequently. By 1988, one thousand assignments of addressspace had been made. As of December 2009[update]...
other network applications. It uses specially reserved multicast address blocks in IPv4 and IPv6. Protocols associated with IP multicast include Internet...
a 4-octet boundary for IPv4. The IPsec protocols use a security association, where the communicating parties establish shared security attributes such...
for IPv4 with an expanded addressingspace. IPv4, which has been in use since 1982, is in the final stages of exhausting its unallocated addressspace, but...
registries. IPv4 uses 32-bit addresses which limits the addressspace to 232 addresses, i.e. 4294967296 addresses. IPv4 is in the process of replacement...
Information (NLRI) it advertises with an address family prefix. These families include the IPv4 (default), IPv6, IPv4/IPv6 Virtual Private Networks and multicast...
the global IPv4address allocation pool was exhausted. Because of the growth of the Internet and the depletion of available IPv4addresses, a new version...
headquarters are in Ebene, Mauritius. Before AFRINIC was formed, IP addresses (IPv6 and IPv4) for Africa were distributed by the Asia-Pacific Network Information...
deployment, which uses 32 bits of IPv6 addressspace to map the entire IPv4addressspace, consumes more addressspace than typical with IPv6 natively supported...
layer 3 for both IPv4 and IPv6 and can encapsulate v4-in-v6 and vice versa. The overhead of WireGuard breaks down as follows: 20-byte IPv4 header or 40 bytes...
indicates which extension header follows. The values are shared with those used for the IPv4 protocol field, as both fields have the same function (see...
Global Information