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64:ff9b:1:: / 48 — A prefix for locally translated IPv4/IPv6 addresses. Addresses with this prefix can be used for multiple IPv4/IPv6 translation mechanisms like NAT64 and SIIT. [31] Compared to 64:ff9b:: / 96, these addresses contain their translated IPv4 address in positions 48-63 and 72-87. [30] This means that for every IPv4 address a ...
A unique local address (ULA) is an Internet Protocol version 6 (IPv6) address in the address range fc00:: / 7. [1] These addresses are non-globally reachable [2] (routable only within the scope of private networks, but not the global IPv6 Internet).
Link-local addresses may be assigned manually by an administrator or by automatic operating system procedures. In Internet Protocol (IP) networks, they are assigned most often using stateless address autoconfiguration, a process that often uses a stochastic process to select the value of link-local addresses, assigning a pseudo-random address that is different for each session.
Unicast address assignments by a local Internet registry for IPv6 have at least a 64-bit routing prefix, yielding the smallest subnet size available in IPv6 (also 64 bits). With such an assignment it is possible to embed the unicast address prefix into the IPv6 multicast address format, while still providing a 32-bit block, the least ...
Since it would not be practical to manually provision networks at scale, in IPv6 networking, DHCPv6 prefix delegation (RFC 3633; RFC 8415 § 6.3) is used to assign a network address prefix and automate configuration and provisioning of the public routable addresses for the network. In the typical case of a home network, for example, the home ...
Most IPv6 networks use autoconfiguration, which requires the last 64 bits of the address for the host. The first 64 bits are the IPv6 prefix. The first 16 bits of the prefix are always 2002:, the next 32 bits are the IPv4 address, and the last 16 bits of the prefix are available for addressing multiple IPv6 subnets behind the same 6to4 router ...
The "well-known prefix" reserved for this service is 64:ff9b:: / 96. An IPv6 client embeds the IPv4 address it wishes to communicate with using the host part of the IPv6 network segment, resulting in an IPv4-embedded IPv6 addresses (hence the 32-bit address space in the IPv6 network segment), and sends packets to the resulting address. The ...
Special address blocks Address block (CIDR) First address Last address Number of addresses Usage Purpose ::/128 :: :: 1 Software Unspecified address