NETWORKING

Subnet Calculator

Enter an IPv4 address and choose the network size. The calculator explains what each value means before showing the usable range.

Enter an IP address

This can be the address of a device, gateway or any address inside the network—for example 192.168.10.42.

Choose the network size

The /24 part is the prefix. It controls how many addresses belong to the network.

IPv4 address Four numbers from 0–255 separated by dots. This does not have to be the network’s first address. Network size (CIDR prefix) A smaller prefix means a larger network. Most small local networks use /24.

Common sizes:

Optional: divide this network into smaller networks

New subnet size Choose a longer prefix to create smaller, equal-sized networks.