Free tool · IP & Subnetting
IP Address Type Checker
Public, private, loopback, APIPA, CGNAT or reserved?
Classifies an IPv4 address as public, private (RFC 1918), loopback, link-local (APIPA), CGNAT, multicast, documentation or reserved. Legacy class A-E is shown for reference only; modern routing is classless (CIDR).
About this tool
Free IPv4 address type checker. Enter any IPv4 address to see whether it is public, private (RFC 1918), loopback, link-local (APIPA), CGNAT, multicast, documentation or reserved, plus its legacy class and 32-bit integer value. Everything runs entirely in your browser — nothing you type is sent to a server.
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