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CIDR contains IP

Check IPv4 and IPv6 addresses against a CIDR range with a visual prefix comparison.

Address membership2 of 3 in range
10.0.0.0/810.0.0.0 → 10.255.255.255

Selected address: 10.0.0.1

Network prefix bits are highlighted in both values.

0000101000000000000000000000000000001010000000000000000000000001
One address per line, up to 256 entries. IPv4 and IPv6 are supported.
Processed on your device

How it works & useful details

How it works & limits

Check up to 256 addresses, one per line, against an IPv4 or IPv6 CIDR. Network and final addresses are included. Host bits in the CIDR input are cleared and the normalized network is shown.

Addresses from a different family are outside the range. An IPv4-mapped IPv6 address remains IPv6 and is not silently converted to IPv4. Malformed entries stop the calculation. Input is limited to 64,000 characters.

Your working space

Explore the live view, then save copyable text and a downloadable file. Everything is calculated locally. Inputs are not stored; refreshing clears them.

These tools inspect address notation and ranges. They do not contact addresses, check availability or establish connectivity.