This is open source software, you are free to download the source and compile it yourself (because I’m that nice), however please help a starving college student out =( 25$ to push apps to the market was a stretch.This subnetting calculator is highly configurable, simply input an IP address, and any other field then hit calculate to fill out the information. Supports both CIDR, and Classless subnetting.Please submit any feature requests, or bug reports 🙂