Tools

IP Subnet Calculator

Work out the network, mask, and host range for IPv4 and IPv6.

Enter an address with a CIDR prefix, or an IPv4 address with a subnet mask. The calculation runs in your browser, so nothing is sent anywhere.

Carrying all of IT yourself?

We work alongside small IT teams on identity, devices, email, and security, so the person who knows the network isn’t also the only one covering Microsoft 365.