IP Address Classifier
Paste any IPv4 or IPv6 address and see whether it's public, private, loopback, multicast, reserved, or carrier-grade NAT.
IPv4 · private
Private (RFC 1918)
Class-A private block. Not routable on the public internet.
Reference: RFC 1918
What we check
Classifications are taken from the IANA Special-Purpose Address Registry — RFC 6890 for IPv4 and RFC 4291 / 6890 for IPv6.
For subnet maths and host counts, pair this with the CIDR / Subnet Calculator.
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