Whois Domain Lookup

WHOIS (pronounced "who is") is a query and response protocol used to lookup domain name registration information. When someone registers a domain, they provide contact and administrative information which is stored in a WHOIS database maintained by the domain registrar. The WHOIS protocol uses TCP port 43 to connect to authoritative WHOIS servers for each top-level domain (TLD).

This tool connects directly to the appropriate WHOIS server for each domain's TLD (e.g., whois.verisign-grs.com for .com domains) and retrieves the raw registration data. It then parses the response to extract key fields like registrar name, creation/expiration dates, name servers, domain status codes, and registrant contact information. Security researchers, system administrators, and domain investors use WHOIS lookups to verify domain ownership, check expiration dates, investigate cyber threats, and research domain registration patterns.

1. Enter domain — Type or paste the domain name into the Domain Name field.
2. Click Lookup — Press Lookup to query the authoritative WHOIS server via TCP port 43.
3. Review results — The parsed information shows registrar, dates, name servers, and domain status. Raw WHOIS data is also displayed.
4. Try examples — Use Valid Example for a registered domain or Invalid Example for an unregistered domain.