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| Initial release | Nov 24, 2008 |
| Current version (2.2.1) | Mar 22, 2012 |
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Subnet Calc is a tool designed to help network administrators who need to remember details about the various subnets which they administer. You can select an IP and a subnet in CIDR notation and Subnet Calc will tell you all the details about the subnet, including it's class and even whether or not the IP is in the loopback / private ranges.