Wildcard mask calculator
Convert between prefixes, netmasks and wildcard (inverse) masks, see exactly which addresses a wildcard matches, test addresses against it, and find one wildcard that covers a set of addresses.
Examples
A dotted value that is a valid netmask is read as a netmask; anything else as a wildcard, so non-contiguous wildcards work too.
Details
Bit by bit
Must match (wildcard 0)Ignored (wildcard 1)
Click or drag across the wildcard bits to choose which bits are checked; click a checked address bit to flip it.