Subnet Calculator

You may enter the subnet mask in either dotted decimal notation or in CIDR format as a number of bits, such as /28 or /24.

IP Address
Subnet Mask

Component Decimal Dot Notation 8 Bit Binary Notation
IP ...
Subnet Mask ...
Network Address ...
Broadcast Address ...
First Useable IP ...
Last Useable IP ...

The WebGnuru Subnet Calculator is available for download at SourceForge.

The WebGnuru Subnet Calculator is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Please see the README file for full licensing disclosure.

Copyright © 2008 - 2013 Andrew Nelson under the GPL v3 License except where noted.
Please see the README file for full licensing disclosure and credits.