How to Use IP Subnet Calculator

Calculate network, broadcast, mask and host range from an IP and CIDR.

What is IP Subnet Calculator?

Calculate network, broadcast, mask and host range from an IP and CIDR. It's completely free, needs no sign-up, and runs entirely in your browser — so it's fast and private.

How to use IP Subnet Calculator

Open the IP Subnet Calculator tool.
Paste or type your input.
Set any options provided.
Copy the result. Everything runs in your browser — nothing is uploaded.

Frequently asked questions

What do I enter?

An IPv4 address with a CIDR prefix, like 192.168.1.0/24.

What does it calculate?

The network and broadcast addresses, subnet and wildcard masks, host range and number of usable hosts.

Ready to try it?

Open IP Subnet Calculator →

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