VLSM Calculator

Variable Length Subnet Mask (VLSM) allows you to create subnets of different sizes to efficiently utilize IP addresses. Enter your major network and add subnet requirements to calculate the optimal VLSM allocation.

All-in-One Subnet Calculator – Use this to perform IPv4 subnetting, CIDR, FLSM, VLSM, and supernetting on a single interface.
VLSM Calculator – Advanced VLSM tool that provides free IP details after calculation.