IPv4 VLSM Calculator, developed by Andro DevNet, is a free utility and tool application available on Android. This app can detect the language you are using and is available in both English and French. It offers a variety of features that can help you calculate and manage network information.

With IPv4 VLSM Calculator, you can calculate network address, broadcast address, mask, maximum number of available addresses, first address, last address, and more. The app also allows you to subnet network with fixed length (FLSM) based on the number of sub networks or hosts in each sub network. Additionally, it enables you to subnet network with a variable length (VLSM) and make conversions between binary, octal, decimal, and hexadecimal bases.

The user manual is simple and easy to follow. You just need to choose the functionality you want, provide the necessary information, and the app will show you the result in a clear and understandable way.