IP Whois Lookup — Owner, Allocation Range, RIR Records
Look up an IP's registrant, registrar, allocation range (CIDR), and country via the modern RDAP protocol.
How to use
Look up registration details for an IPv4 or IPv6 address using the RDAP protocol — the modern replacement for legacy WHOIS.
- Enter an IPv4 or IPv6 address in the search box.
- Press "Submit" to query the responsible RIR over RDAP.
- The result shows the assigned CIDR range, registrant, registrar, country, handle, and registration / update events.
- Expand "Raw RDAP Data" to inspect the full JSON response.
Each RIR (ARIN, RIPE, APNIC, AFRINIC, LACNIC) has its own privacy policy, so some fields may be redacted. The registrant is often a delegating ISP rather than the end user.