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IPv6 addresses are assigned to organizations in much larger blocks as compared to IPv4 address assignments—the recommended allocation is a / 48 block which contains 2 80 addresses, being 2 48 or about 2.8 × 10 14 times larger than the entire IPv4 address space of 2 32 addresses and about 7.2 × 10 16 times larger than the / 8 blocks of IPv4 ...
Formerly used for IPv6 to IPv4 relay [8] (included IPv6 address block 2002::/16). 192.168.0.0/16 ... Special address blocks Address block (CIDR) First address
Such a dual-stack DNS server holds IPv4 addresses in the A records and IPv6 addresses in the AAAA records. Depending on the destination that is to be resolved, a DNS name server may return an IPv4 or IPv6 IP address, or both. A default address selection mechanism, or preferred protocol, needs to be configured either on hosts or the DNS server.
The large address size of IPv6 permitted worldwide route summarization and guaranteed sufficient address pools at each site. The standard subnet size for IPv6 networks is a / 64 block, which is required for the operation of stateless address autoconfiguration. [17]
There are two primary types of IP addresses in use today: IP version 4 (IPv4) and IP version 6 (IPv6). ... The IANA created blocks of IP addresses, assigning them to regions throughout the world ...
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.
The concept of private networks has been extended in the next generation of the Internet Protocol, IPv6, and special address blocks are reserved. The address block fc00:: / 7 is reserved by IANA for unique local addresses (ULAs). [2]
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]