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Used for link-local addresses [5] between two hosts on a single link when no IP address is otherwise specified, such as would have normally been retrieved from a DHCP server 172.16.0.0/12 172.16.0.0–172.31.255.255
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 ...
The special behaviour for this type of addresses, as required at that time, [5] was lifted in 2006 and the block returned to regular global unicast. [6] In October 2005, the IETF reserved the address block fc00::/7 for use in private IPv6 networks and defined the associated term unique local addresses. [1]
Multicast address scope IPv6 address [note 1] IPv4 equivalent [19]: §8 Scope [28] Purpose ffx0::/16, ffxf::/16: Reserved ffx1::/16: Interface-local Packets with this destination address may not be sent over any network link, but must remain within the current node; this is the multicast equivalent of the unicast loopback address. ffx2::/16: ...
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]
The Internet Engineering Task Force (IETF) has reserved the IPv4 address block 169.254.0.0 / 16 (169.254.0.0 – 169.254.255.255) for link-local addressing. [1] The entire range may be used for this purpose, except for the first 256 and last 256 addresses (169.254.0.0 / 24 and 169.254.255.0 / 24), which are reserved for future use and must not be selected by a host using this dynamic ...
In the Domain Name System (DNS), hostnames are mapped to IPv6 addresses by AAAA ("quad-A") resource records. For reverse resolution, the IETF reserved the domain ip6.arpa, where the name space is hierarchically divided by the 1-digit hexadecimal representation of nibble units (4 bits) of the IPv6 address.
IP version Description Status 0: Internet Protocol, pre-v4: Reserved. [3]1–3: Unassigned. 4: Internet Protocol version 4 (IPv4) [1]: Active. 5: Internet Stream Protocol or ST: Obsolete; superseded by ST-II.