IP range to CIDR
Minimal exact covering blocks.
Enter the first address here and the last address in Ending IP address below. Results update as you type. Up to 1,000,000 characters.
Your result
How to use IP range to CIDR
- Enter starting ip address in the input field.
- The result updates as you type. Adjust the available settings if needed.
- Review the result, then use Copy result or a download link when available.
Useful next steps
Working with ip range to cidr
A network lookup is a snapshot from a particular resolver, location and time. DNS answers, routing paths and certificates can change, so a result is most useful when the query and observation time are clear.
Common questions
Why do DNS results differ between locations?
Resolvers can cache records for different periods, and some services deliberately return location-specific answers. A mismatch does not on its own identify a configuration fault.
Can browser code perform every network check?
Browsers restrict arbitrary network access. Some diagnostics need a server or a public service; that service’s observation point affects what the result means.
Continue your workflow: Subnet calculator, CIDR to range, Ipv6 compress.