Subnet Membership

Test whether an IPv4 or IPv6 address sits inside a CIDR subnet, or compare two addresses to see if they share a prefix and how far apart they are. Useful for ACL checks, route planning, and quick containment tests. Runs entirely in your browser.

All IP tools

Works for IPv4 and IPv6. Mixed versions are rejected with a clear error.

IP in subnet?

Ask whether a single address falls inside a CIDR block.

IP address

CIDR

Same subnet / distance

Compare two addresses under a shared prefix length and show how far apart they are.

Address A

Address B

Prefix length

More IP tools

Related terms

ip belongs to network
subnet containment
address range check
same network test
cidr includes ip
ip overlap check

IP in subnet?

Same subnet / distance

Related search terms