IP in range checker
Check whether an IPv4 address falls inside one or more CIDR ranges.
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About the ip in range checker
Tests whether an IPv4 address falls inside one or more CIDR ranges, checking against every range at once and reporting each verdict separately. Useful for confirming an allowlist, a firewall rule or a geo-block before it goes live.
Frequently asked questions
Can I check several ranges at once?
Yes — put one CIDR per line. Every range is evaluated independently and the summary counts how many contain the address.
What does /32 mean in a rule?
A single host. The mask covers all 32 bits, so the block contains exactly one address — the usual way to allowlist one specific machine.