The CIDR Calculator enables CIDR network calculations using IP address, subnet mask, mask bits, maximum required IP addresses and maximum required subnets.
Results of the CIDR calculation provide the wildcard mask, for use with ACL (Access Control Lists), , network address in CIDR notation and the CIDR address range for the resulting CIDR network.
For classful subnets, use the IP Subnet Calculator. For a simple smart-phone optimized CIDR Calculator, visit CIDR Calc. For ACL (Access Control List) wildcard mask calculations, use the ACL Wildcard Mask Calculator.