The **Subnet / VLSM Calculator app** is a powerful tool that allows users to perform a wide range of subnet-related calculations for IPv4 addresses. With this app, you can effortlessly determine various network parameters, including: 1. **Classful Subnet List**: Quickly generate a list of subnets based on the classful addressing scheme. 2. **Broadcast Address**: Find the broadcast address for a given subnet. 3. **Network Address**: Obtain the network address corresponding to a specific subnet.