WHOIS Lookup
Look up who a domain or IP address is registered to, which registrar or registry manages it, and when it was created or allocated.
Looking up WHOIS data for 8.8.8.8…
What is a WHOIS lookup?
Every registered domain has a registration record on file with the registry that runs its TLD: who registered it (or, more often today, which privacy service stands in for them), which registrar manages it, and the dates it was created, last updated, and is due to expire. A WHOIS lookup is how you read that record directly, the same information a registrar checks before letting anyone register a domain that's already taken.
How this WHOIS lookup works
You enter a domain
Type in any domain name and this tool works out which registry actually holds its registration records, starting from its TLD.
RDAP is checked first
RDAP is the modern, structured replacement for WHOIS that ICANN now requires of most registries — it answers in clean JSON instead of free-text, so this tool queries it first whenever the domain's TLD supports it.
Classic WHOIS as a fallback
Not every TLD has switched to RDAP yet. When one hasn't, this tool falls back to the original WHOIS protocol: asking IANA which registry is authoritative, then querying that registry directly over the wire.
You get both a summary and the raw response
Registrar, key dates, name servers, and status codes are parsed into a plain summary, and the full, unedited response is always available underneath it — nothing here is guessed or reformatted from what the registry actually said.
Why some registrant details are hidden
Domain registration records used to list a registrant's name, address, phone number, and email in the open. Since the GDPR took effect, that's no longer the default: most registrars now redact personal contact details from public WHOIS/RDAP responses, and many domain owners additionally pay for a privacy/proxy service that publishes its own contact details in place of theirs entirely. A registrant organization name often still comes through for business domains; individual registrants are usually fully redacted now. Neither case means the lookup failed, it means the registry is doing exactly what current privacy rules require.
WHOIS lookup vs. DNS lookup
The two answer genuinely different questions about the same domain. A WHOIS lookup describes the registration itself: who it belongs to, which registrar manages it, when it expires. A DNS lookup describes where that domain currently points: its IP addresses, mail servers, and other published records. A domain's WHOIS record rarely changes month to month; its DNS records can change constantly. Need to check propagation across resolvers worldwide instead of a single lookup? DNS Checker covers that.
Frequently asked questions
What is a WHOIS lookup?
A WHOIS lookup asks the registry responsible for a domain's TLD who registered it, which registrar manages it, and when it was created, last updated, and set to expire. It's a different question than a DNS lookup: DNS records describe where a domain points to right now, WHOIS describes who owns the registration itself.
Why is the registrant's name or address missing?
Almost certainly WHOIS privacy, not a failure of this tool. Since GDPR took effect, most registrars redact a domain's personal registrant details by default, or a domain owner has opted into a privacy/proxy service (something like "Domains By Proxy" or "WhoisGuard") that publishes the proxy's own contact details instead of the registrant's. An organization name still shows through in many cases; an individual's personal details usually don't anymore.
What's the difference between WHOIS and RDAP?
Same underlying idea, different protocol. WHOIS (from the 1980s) returns an unstructured block of text with no fixed format, so every registry writes its own. RDAP (Registration Data Access Protocol) is its modern, ICANN-mandated replacement: structured JSON over HTTPS with a defined schema, far easier to parse reliably. This tool prefers RDAP whenever a domain's TLD supports it and only falls back to classic WHOIS when it doesn't.
Why does a lookup sometimes say "lookup incomplete" instead of showing a result?
That means neither RDAP nor classic WHOIS returned a usable response — a registry timeout, a TLD with no public WHOIS/RDAP service at all, or a temporary network issue. It's deliberately never shown as "available," since that would be a real, incorrect claim about a domain this tool simply couldn't reach an answer for.
Does a WHOIS lookup tell me if a domain is available to register?
It's a strong signal, not a guarantee. No record found generally means nobody currently holds the domain, but actual availability can only be confirmed by a registrar at the moment you try to register it — a domain can be reserved, in a redemption grace period after expiring, or registered moments after this lookup ran.