Private IP Checker

Enter any IPv4 address to check whether it is private, loopback, link-local, CGNAT, or public.

IP address

Private (RFC 1918)Yes

Scopeprivate

ClassificationPrivate (192.168.0.0/16, RFC 1918)

How to read the result

RFC 1918 reserves 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 as private. CGNAT space 100.64.0.0/10 looks private but is shared carrier space, not RFC 1918.

Example

10.0.0.5 → Private (10.0.0.0/8, RFC 1918). 100.64.0.1 → CGNAT, not private.

FAQ

Is 100.64.x.x private?

No. It is CGNAT shared space (100.64.0.0/10), not RFC 1918 private.

Is 127.0.0.1 private?

It is loopback, not routable. This tool marks it non-RFC1918 but not public.

Is my input sent anywhere?

No. Classification runs entirely in your browser.