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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 ...
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:
The number of available subnets is 2 n, where n is the number of bits used for the network portion of the address. There is an exception to this rule for 31-bit subnet masks, [ 11 ] which means the host identifier is only one bit long for two permissible addresses.