IPv4 / CIDR Calculator

Compute network address, broadcast, host range, and subnet mask from an IPv4 address in CIDR notation.

Network address192.168.1.0/24
Broadcast address192.168.1.255
Subnet mask255.255.255.0
Wildcard mask0.0.0.255
First host192.168.1.1
Last host192.168.1.254
Usable hosts254

How to use

  1. Pick the tool you want to use.
  2. Enter your input or adjust the options.
  3. Copy or download the result.

FAQ

Is it free to use?

Yes. All features are free with no usage limits, and no account is required.

Is my input sent to a server?

No. Everything runs locally in your browser — your data never leaves your device.

Does it work on smartphones?

Yes. It works on both desktop and mobile with modern browsers such as Chrome, Edge, Firefox and Safari.