Subnet Manager is an easy to use app for managing and calculating networks and subnets. It supports subnetting with VLSM. Calculated networks can be stored in sync on the devices. When entering address and mask, it provides a structured overview of all information of the calculated networks. The networks can be persisted on the device storage and used to build efficient subnets with the subnet builder. Subnetting allows you to manipulate the desired number of networks and addresses inside those networks (VLSM). The subnetworks thus created, can also be persisted on the device storage.