Enter an IPv4 CIDR block to get the network address, broadcast address, subnet mask, usable host range, and host count.
The CIDR Calculator is a free networking tool. Enter an IPv4 CIDR block and get the network address, broadcast address, subnet mask, usable host range, and host count. Runs directly in the browser with no account required.
Enter an IPv4 CIDR block and get the network address, broadcast address, subnet mask, usable host range, and host count. It runs directly in your browser with no account required.
Open /cidr, review the page output, and copy the generated result into your docs, tests, support notes, or debugging workflow.
This page is designed as a browser utility. Use the copy-friendly output when you need to move results into another workflow.
The CIDR Calculator is useful for developers, QA teams, support teams, operators, and content teams that need reliable networking output without opening a heavier application.