Reserved ad space · responsive display
Inputs
Convert an IPv4 CIDR prefix into subnet and wildcard masks.
Result
Result
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How to use this tool
An IPv4 wildcard mask is the bitwise inverse of a subnet mask. It is commonly used in network access control lists and routing configuration to identify which address bits may vary. Enter a CIDR prefix length to view both masks and the size of the address block. Wildcard masks are not themselves IP addresses, and vendor-specific configuration syntax may vary.
Reserved ad space · content placement