Subnet Calculator is a free Android application developed by Kallyn Gowdy that helps users learn about a specific subnet by simply typing in an IP address and subnet mask. This utility tool supports both Internet Protocol Version 4 and 6 and provides results for network address, broadcast address, first address, last address, next network, and last network.

The app has a simple interface that is easy to use. Users can long-tap on any of the results to copy it to the clipboard. The app also features a material design that makes it visually appealing. With Subnet Calculator, users can quickly and accurately learn about any subnet they need to.