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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. Both fields are eight bits wide.
IPv4-compatible IPv6 unicast address IPv4-mapped IPv6 unicast address Hybrid dual-stack IPv6/IPv4 implementations recognize a special class of addresses, the IPv4-mapped IPv6 addresses. [ 62 ] : §2.2.3 [ 36 ] These addresses are typically written with a 96-bit prefix in the standard IPv6 format, and the remaining 32 bits are written in the ...
Packets that hold Internet Protocol data carry a 4-bit IP version number as the first field of its header. [ 1 ] [ 2 ] Currently, only IPv4 and IPv6 packets are seen on the Internet , having IP version numbers 4 and 6, respectively.
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 ...
IPv4 addresses are defined as a 32-bit number, which became too small to provide enough addresses as the internet grew, leading to IPv4 address exhaustion over the 2010s. Its designated successor, IPv6, uses 128 bits for the IP address, giving it a larger address space.
Number of addresses Scope Description 0.0.0.0/8 0.0.0.0–0.255.255.255 ... Formerly used for IPv6 to IPv4 relay [8] (included IPv6 address block 2002::/16).
There is a difference between a "relay router" and a "border router" (also known as a "6to4 border router"). A 6to4 border router is an IPv6 router supporting a 6to4 pseudo-interface. It is normally the border router between an IPv6 site and a wide-area IPv4 network, where the IPv6 site uses 2002:: / 16 co-related to the IPv4 address used later ...
6in4, sometimes referred to as SIT, [a] is an IPv6 transition mechanism for migrating from Internet Protocol version 4 (IPv4) to IPv6. It is a tunneling protocol that encapsulates IPv6 packets on specially configured IPv4 links according to the specifications of RFC 4213. The IP protocol number for 6in4 is 41, per IANA reservation. [1]