How to use cidr / subnet calculator
Calculate an IPv4 network, mask, address range and host interpretation from an address and CIDR prefix.
- Enter your own values or choose a supported file.
- Adjust the options and run the tool.
- Review the result, then copy, export or save it when available.
Try this next
Enter 192.0.2.143/27 to inspect its network and conventional host range.
Conventional broadcast subnets, /31 point-to-point links and /32 host routes have different host rules. This calculator labels those cases explicitly.
Questions, answered.
Is cidr / subnet calculator free to use?
Yes. This tool is part of Nepocore’s free browser toolkit. There is no paid tier, file-download gate or application account required.
What should I check before using the result?
Conventional broadcast subnets, /31 point-to-point links and /32 host routes have different host rules. This calculator labels those cases explicitly.
Does this tool upload my files or text?
The tool processes its input in your browser. File contents and text are not sent to a processing server. See the privacy page for local storage and hosting details.