IP Lookup
Processing: API. Processed by cent-ai's API: sent to our server, held in memory, never stored.Enter an IPv4 or IPv6 address to see its classification and reverse DNS record. Nothing you enter here is stored or logged.
How to use it
- Enter an IPv4 or IPv6 address, e.g.
8.8.8.8. - The classification and PTR record appear automatically, or select “Look up” to run it immediately.
- Copy the result to your clipboard.
Example
Select “Use example” above to load a sample address, or try input like:
2001:4860:4860::8888
Privacy and security
- The address is sent to our API only to classify it and issue the PTR query; it is never persisted or logged.
- Requests are not included in analytics or error reporting.
- Request bodies are limited in size to keep the service responsive for everyone.
Limitations
- No geolocation, ASN, or ISP data — classification and reverse DNS only.
- IPv6 zone/scope IDs (e.g.
fe80::1%eth0) are not supported.
FAQ
Does this tool provide geolocation, ASN, or ISP data?
No — that data requires a third-party service, and this tool doesn't call one. It only classifies the address (public, private, loopback, etc.) and looks up its reverse DNS record.
Why does classification matter?
It tells you whether an address is publicly routable or falls in a reserved range — for example, private (RFC 1918), loopback, link-local (which includes the 169.254.169.254 cloud instance metadata address), or multicast.
What if there's no reverse DNS record?
The result shows "(none)" — not every IP address has a PTR record configured.