Subnet Calculator
Calculate IPv4 or IPv6 subnet information locally in your browser.
Processed locally — your input stays in this browser.
Examples and edge notes
IPv4 examples: 192.168.1.130/24 and 203.0.113.10/30. IPv6 examples: 2001:db8::1/64 and ::1/128. IPv6 results intentionally have no broadcast field.
About Subnet Calculator
Inspect an IPv4 or IPv6 subnet, including prefix boundaries and address counts.
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.