IP Address Lookup
Look up registration data (RDAP/whois) and reverse DNS for any IP address.
What this IP lookup tool does
Enter any IPv4 or IPv6 address to see its registration data via RDAP (the modern replacement for WHOIS) together with its reverse DNS name. You get the network name, the registrant organization, the country, the allocated CIDR block, the managing RIR and the abuse contact.
RDAP is queried through rdap.org, which routes to the correct regional registry (ARIN, RIPE NCC, APNIC, LACNIC, AFRINIC). To see the routing/AS view of the same address, use the ASN lookup. To see your own address, just open the home page.
Frequently asked questions
What is the difference between RDAP and WHOIS?
RDAP returns structured JSON with consistent fields and supports internationalization and access control, while classic WHOIS returns free-form text that varies by registry. ICANN is transitioning gTLD registration data to RDAP, so it is the more future-proof source.
Why is the "country" not where the user actually is?
The country in RDAP is where the address block is registered, which often differs from the device's physical location. For real geolocation you need a dedicated IP-geolocation database, not registry data.
The abuse contact is empty — why?
Not every network publishes an abuse mailbox in a machine-readable way, and some registries nest it deep in the entity records. When present we surface it; when absent, check the registrant organization's website.