Subnetting Calculator is a free Android application developed by Rooster Glue Inc. It is a powerful tool designed for network administrators to calculate IPv4 IP address ranges, number of hosts, broadcast address, and subnet masks. The app performs both traditional classful (A, B, C) subnet mask and classless (CIDR) subnet mask calculations.

The app is easy to use and has a simple interface that allows users to quickly and accurately calculate subnetting information. With the ability to perform both classful and classless subnetting, network administrators can efficiently manage their networks. The app is designed to make IPv4 addressing calculations easier for network administrators and is an essential tool for anyone working in the field.