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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, they are used in several places, for example:
A wildcard mask can be thought of as an inverted subnet mask. For example, a subnet mask of 255.255.255.0 inverts to a wildcard mask of 0.0.0.255.
A wild card mask is a matching rule. The rule for a wildcard mask is:
Any wildcard bit-pattern can be masked for examination. For example, a wildcard mask of 0.0.0.254 applied to IP address 10.10.10.2 will match even-numbered IP addresses 10.10.10.0, 10.10.10.2, 10.10.10.4, 10.10.10.6 etc. Same mask applied to 10.10.10.1 will match odd-numbered IP addresses 10.10.10.1, 10.10.10.3, 10.10.10.5 etc.
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