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TCP/IP Subnet Calculator

Simple TCP/IP subnet calculator that will show you the subnet id and broadcast IP for a given IP address and subnet mask. Mask can be provided in a slash notation (number of bits, i.e. /16), dotted decimal (i.e. or proprietary Cisco reverse mask (i.e. Depending on which method mask is provided in it will calculate the other formats and display them. Will also show the number of valid host IP's in the given subnet. Also has a subnet aggregater feature where you provide a list of subnets and it returns a list of where all adjacent subnets have been replaced by the appropriate supernet.
There is a registration button in the app that only shows your name on the splash screen. No data is collect nor transmitted anywhere.
Please download it for free, check it out and provide us with feedback at ipcalc@gooeynet.net. Also please let us know if you have any questions or run into problems using the application.

For a command line version in Python grab IPCalc.py from my bitbucket python collection.


Only tested on Windows XP and Windows Vista, other windows version may work. If you don't have these required Microsoft Windows components installed they will be installed as part of the installation.
  • Windows Installer 3.1
  • .NET Framework 3.5 (Requires reboot before installation can be completed)
  • Internet connection (Current version does the installation via the internet)

Delivery Options available

This product is currently only available in downloadable format and must be installed while connected to the internet.

Download it free