IPv4 subnet calculator
Calculate network addresses, masks and usable ranges from IPv4 CIDR notation.
Your results
IPv4 subnet calculator
Work out the network boundary and address range for an IPv4 CIDR block during network planning. Enter the address and prefix length, then review the mask and host information. The calculation describes the block without contacting any devices.
How to use this tool
- Enter the details above.
- Review the settings and create your result.
- Download and check the output before using it.
Available settings
- IPv4 address / prefix
Output and limitations
Calculate network addresses, masks and usable ranges from IPv4 CIDR notation.
Supports prefixes /0 through /32. A /31 uses two point-to-point host addresses; a /32 represents one host route. No network requests are made and address availability is not checked.
Where are my files processed?
Selected files are processed in your browser. Importing a URL uses the download service to retrieve the remote file.
What if processing fails?
Check the supported formats and file limits, then try a smaller file. Keep an original copy. A clear error message will explain an unsupported input or an unavailable processing service.