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A wildcard mask is a mask of bits that indicates which parts of an IP address are available for examination. In the Cisco IOS, [1] they are used in several places, for example:
A subnet mask is a bitmask that encodes the prefix length associated with an IPv4 address or network in quad-dotted notation: 32 bits, starting with a number of 1-bits equal to the prefix length, ending with 0-bits, and encoded in four-part dotted-decimal format: 255.255.255.0. A subnet mask encodes the same information as a prefix length but ...
IP addresses in dot-decimal notation are also presented in CIDR notation, in which the IP address is suffixed with a slash and a number, used to specify the length of the associated routing prefix. For example, 127.0.0.1/8 specifies that the IP address has an eight-bit routing prefix, and therefore the subnet mask 255.0.0.0.
In the past, the recommended allocation for an IPv6 customer site was an address space with a 48-bit (/ 48) prefix. [20] However, this recommendation was revised to encourage smaller blocks, for example using 56-bit prefixes. [21] Another common allocation size for residential customer networks has a 64-bit prefix.
In bold below is shown the host part (suffix) of the IP address, with the network address prefix being the non-bold bits to its left. To obtain the broadcast address, the host bits get set to all 1's, while the network address prefix bits remain intact. 1. Network IP address 10101100.00010000.00000000.00000000: 172.16.0.0 2.
Unicast-prefix-based The 234.0.0.0 / 8 range is assigned as a range of global IPv4 multicast address space provided to each organization that has / 24 or larger globally routed unicast address space allocated; one multicast address is reserved per / 24 of unicast space. [ 17 ]