IP Range Calculator
Calculate the full and usable IPv4 ranges for an address and CIDR prefix or contiguous subnet mask.
Processed locally — your input stays in this browser.
Examples and edge notes
Try 192.168.1.10/24, 203.0.113.10/31, and 192.0.2.42/32. Range arithmetic uses unsigned IPv4 values.
About IP Range Calculator
Find the mathematical IPv4 address range covered by a CIDR network.
How to use it
Enter the requested value, review it for accuracy, then run the tool. Read the labeled result fields before copying or using them in another workflow.
Understanding the result
The result presents the values returned or calculated for this specific request. Labels and status messages distinguish successful data, empty results, validation problems, and network errors.
Limitations and privacy
Results are calculated from the values you provide and should be verified against your network requirements before operational changes. Runs locally in your browser; the value you enter is not sent to the Network Tools API.