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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 ...
Each / 8 block contains 256 3 = 2 24 = 16,777,216 addresses, which covers the whole range of the last three delimited segments of an IP address. This means that 256 /8 address blocks fit into the entire IPv4 space.
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
[6] [7] If a host on an IEEE 802 network cannot obtain a network address via DHCP, an address from 169.254.1.0 to 169.254.254.255 [Note 2] may be assigned pseudorandomly. The standard prescribes that address collisions must be handled gracefully.
Also, 192.168.0.0 is the network identifier and must not be assigned to an interface. [ 19 ] : 31 The addresses 192.168.1.0 , 192.168.2.0 , etc., may be assigned, despite ending with 0. In the past, conflict between network addresses and broadcast addresses arose because some software used non-standard broadcast addresses with zeros instead of ...
A wildcard mask is a mask of bits that indicates which parts of an IP address are available for ... /24: 255.255.255.0: 0.0.0.255 ... This page was last edited on 7 ...
fc00:: / 7 — Unique local addresses (ULAs) are intended for local communication [39] (comparable to IPv4 private addresses 10.0.0.0 / 8, 172.16.0.0 / 12 and 192.168.0.0 / 16). They are routable only within a set of cooperating sites. The block is split into two halves.
CIDR notation can even be used with no IP address at all, e.g. when referring to a / 24 as a generic description of an IPv4 network that has a 24-bit prefix and 8-bit host numbers. For example: 198.51.100.14 / 24 represents the IPv4 address 198.51.100.14 and its associated network prefix 198.51.100.0 , or equivalently, its subnet mask 255.255 ...