How to find a domain owner: WHOIS, RDAP and private records
Read public registrant details, registrar information, redaction notices and expiration dates without confusing missing data with hidden ownership.
How WHOIS and RDAP lookups differ
WHOIS is a long-established protocol for registration queries. RDAP provides structured responses for the same purpose. Astrotor uses IANA’s directory to locate a supported HTTPS RDAP service and queries it from the server. You do not need an API key or an account with the service; the available results depend on what it publishes.
Enter a registered name such as example.com, without www or a page path. If a suitable referral is available, the registrar’s separate response is queried too. ICANN explains RDAP’s purpose and use.
Which fields can identify the owner?
Published registrant and organization fields may contain public owner details. The registrar field identifies the registration provider instead. A domain company appearing there does not mean it operates the website. Nameservers and IP addresses do not independently verify an owner’s identity either.
The published registrant may be a privacy or proxy service. If you want to contact an owner about a purchase, use the website’s published contact channels or the registrar’s available contact process. A public lookup does not replace account access, proof of ownership or identity verification.
Hidden information or simply missing information?
When the RDAP response explicitly marks registrant fields as redacted, Astrotor shows a notice. Clear placeholders such as “REDACTED FOR PRIVACY” also provide a signal. An empty field alone does not: the service may omit it, or the additional registrar response may be unavailable.
A redaction notice does not prove the owner personally enabled a privacy setting; the service’s publication policy can also apply. The tool cannot reveal hidden details. Published organizations, dates and other fields remain visible. The sources section identifies which services supplied the report, and the TXT download retains the explanation.
Read expiration dates and missing records carefully
Registry and registrar expiration dates can differ. Astrotor labels them separately and uses explicitly published registrar expiration for the remaining-day count, falling back to registry expiration. Dates are displayed in UTC. Expiration does not mean immediate availability for someone else to register; confirm renewal in your own account.
An unsupported extension can produce a “cannot be queried” message. For a missing record, check spelling and whether you entered a subdomain. Service failure, no record and redacted ownership are different outcomes; none alone confirms availability. The domain, hosting and DNS introduction explains the underlying roles.
Domain lookup
Query the registered domain without www or a path. Review ownership, dates and sources, then download an Astrotor-signed TXT report.
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