Who owns this domain?
WHOIS, and its modern successor RDAP, expose the public registration record for a domain — who registered it, when, and through which registrar. This tool queries RDAP over HTTPS and returns registrar, creation and expiry dates, name servers, abuse contacts, and reverse DNS.
Corrections welcome — see our editorial policy.
What is WHOIS / RDAP?
RDAP (Registration Data Access Protocol) is the modern successor to the legacy WHOIS protocol. When you register a domain, the registration goes into a public registry. RDAP exposes that data over HTTPS as structured JSON, instead of the unstructured text format that the original 1982 WHOIS protocol used.
For gTLDs (.com, .net, .org and most others), ICANN required all registrars and registries to support RDAP by January 2025. The Regional Internet Registries (ARIN, RIPE NCC, APNIC, LACNIC, AFRINIC) run RDAP for IP and ASN records too, but this tool no longer offers IP lookups. Their terms restrict what an ad-supported product may do with registry data — ARIN prohibits use “as part of a commercial service or product” and “for advertising”, and excludes “make publicly available” from permitted use; RIPE and APNIC carry equivalent clauses. Rather than serve that data on terms we cannot meet, we retired the IP side in August 2026. Domain registration data carries no such restriction and is unaffected.
Why is some data redacted?
Since GDPR took effect in 2018, registries and registrars have been required to suppress most registrant contact information from public lookups. You'll typically see the registrar, dates, name servers, and EPP status codes — but the registrant's name and email are usually replaced with the registrar's privacy proxy. The full data is still on file with the registrar; it's just not public.
What are the known limitations?
Some country-code TLDs — notably .de, .cn, .jp, .uk, .it, .ch, .kr, and .pl — have not adopted RDAP and still require legacy port-43 WHOIS. Cloudflare Workers can't open raw TCP connections to external servers, so this tool returns a clean error for those rather than fake-supporting them.
Registrant contact data is also frequently redacted under GDPR and ICANN privacy policies — that's a feature of the registry, not a limitation of this tool.