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A wildcard mask can be thought of as an inverted subnet mask. For example, a subnet mask of 255.255.255.0 (11111111.11111111.11111111.00000000 2) inverts to a wildcard mask of 0.0.0.255 (00000000.00000000.00000000.11111111 2). A wild card mask is a matching rule. [2] The rule for a wildcard mask is: 0 means that the equivalent bit must match
This allows for 62 host combinations (2 6 −2). In general, the number of available hosts on a subnet is 2 h −2, where h is the number of bits used for the host portion of the address. The number of available subnets is 2 n, where n is the number of bits used for the network portion of the address.
Its prefix length is 128 which is the number of bits in the address. In IPv4, CIDR notation came into wide use only after the implementation of the method, which was documented using dotted-decimal subnet mask specification after the slash, for example, 192.24.12.0 / 255.255.252.0. [2]
The term subnet mask is only used within IPv4. Both IP versions however use the CIDR concept and notation. In this, the IP address is followed by a slash and the number (in decimal) of bits used for the network part, also called the routing prefix. For example, an IPv4 address and its subnet mask may be 192.0.2.1 and 255.255.255.0, respectively.
If both the subnet mask and the router option (option 3) are included, the subnet mask option must be first. 2: Time offset: 4 octets: Offset of the client's subnet in seconds from Coordinated Universal Time (UTC). The offset is expressed as a two's complement 32-bit integer.
CIDR notation combines the address with its routing prefix in a compact format, in which the address is followed by a slash character (/) and the count of leading consecutive 1 bits in the routing prefix (subnet mask). Other address representations were in common use when classful networking was practiced.
After the sale of 44.192.0.0 / 10 delete in 2019, the remaining Internet protocol (IP) addresses are the 44.0.0.0 / 9 delete for USA subnets and 44.128.0.0 / 10 delete subnet for the rest of the world, available to any licensed amateur radio operator. [11]
A routing prefix in the range fd00:: / 8 may be constructed by generating a random 40-bit hexadecimal string, taken for this example to be 0x123456789a. The string is appended to the prefix fd00:: / 8 , which forms the 48-bit routing prefix fd12:3456:789a:: / 48 .