WHOIS and RDAP
WHOIS is the long-standing way to look up who registered a domain or owns a block of IP addresses. RDAP (Registration Data Access Protocol) is its modern replacement: it returns the same kind of information as structured JSON over HTTPS, which is more reliable and consistent. This tool uses RDAP under the hood.
What you can find out
- Domains - registrar, creation/expiry/update dates, status codes, and nameservers.
- IP addresses - the owning organization, the allocated range, country, and type.
Note that many domains use privacy protection, so personal contact details are often redacted by the registrar.
How this works
This tool runs on our server, which queries the authoritative RDAP service for the domain or IP you enter and flattens the response. We store nothing.