Network Mask Calculator

This simple Access Control List (ACL) wildcard mask calculator calculates First address and Last address. To calculate just enter the IP address and select the Wildcard Mask.

The Wildcard Mask is inverted form of subnet mask and is used as an extension of IP address. It allows passage to data from the IP address and its associated mask range.

In order to calculate CIDR supernetting, use the CIDR calculator. To calculate classful subnetting, the IP Subnet Calculator can be used.