CIDR Calculator

Enter an IPv4 CIDR such as 192.168.1.42/24 to inspect network, broadcast, usable hosts, subnet mask, wildcard mask, and binary details.

IPv4 CIDR

Split into smaller subnets (optional)

—Network

—Broadcast

—Subnet mask

—Usable hosts

ReadyEnter an IPv4 CIDR block.

How to use this CIDR Calculator

Calculate IPv4 network ranges, masks, host counts, and boundaries from CIDR notation. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.