IP Subnet Calculator
The IP Subnet Mask Calculator enables subnet network calculations using network class, IP address,subnet mask, subnet bits, mask bits, maximum required IP subnets and maximum required hosts per subnet.
http://www.subnet-calculator.com/
CIDR Calculator
The CIDR Calculator enables CIDR network calculations using IP address, CIDR mask (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), CIDR network address (CIDR route), network address in CIDR notation and the CIDR address range for the resulting CIDR network.
http://www.subnet-calculator.com/cidr.php
Wildcard Mask Calculator
The ACL Wildcard Mask Calculator enables wildcard mask calculations using IP address and wildcard mask.
Results of the wildcard mask calculation provide the first IP address and last IP address in the wildcard mask network range.
http://www.subnet-calculator.com/wildcard.php