Wildcard masks are the inverse of the subnet mask.
The word "any" indicates that all corresponding bits must be matched.
• The word "host" corresponds to a wildcard mask of 0.0.0.0 in an ACL statement.
• A wildcard mask of 0.0.255.255 can be used to create a match for an entire Class B network.
A wildcard mask bit of 1 indicates that the corresponding bit in the address must be matched.