What is a WHOIS lookup?

A WHOIS lookup queries public registration databases to find information about a domain name, including the registrar, registration and expiry dates, nameservers, and domain status codes. It is a standard internet protocol defined in RFC 3912.

How do I find out who owns a domain?

Enter the domain name in the WHOIS Lookup tool above. It queries the appropriate WHOIS server and displays registrar information, registration dates, nameservers, and registrant details (when not privacy-protected). Many domain owners use WHOIS privacy services to redact personal contact information.

Is this WHOIS lookup tool free?

Yes, the ServiceAlert.ai WHOIS Lookup tool is completely free with no signup required. Enter any domain and view its registration information instantly.

WHOIS Lookup

Look up domain registration details — registrar, creation & expiry dates, nameservers, and status codes.

Quick Lookup Popular Domains

Free WHOIS Domain Lookup

WHOIS is a public query protocol that retrieves registration information for internet domain names. Originally defined in RFC 3912, WHOIS databases are maintained by domain registrars and registries, providing transparency about domain ownership and administrative contacts.

What Information Does WHOIS Show?

Registrar identifies the company where the domain was registered (e.g., GoDaddy, Namecheap, Cloudflare). Registration dates show when the domain was first created, last updated, and when it expires — useful for spotting domains that may lapse soon.

Nameservers indicate which DNS servers are authoritative for the domain, telling you where its DNS is hosted. Domain status codes (EPP status codes like clientTransferProhibited) reveal any restrictions on the domain, such as transfer locks or pending deletions.

Registrant information may include the organization name and country, though many owners use WHOIS privacy services to redact personal details in compliance with GDPR and ICANN regulations.

Related Tools

Combine WHOIS data with our other free tools for a complete domain picture: DNS Lookup to inspect DNS records, SSL Checker to verify certificate health, and Response Time to measure server performance.

Need Continuous Monitoring?

WHOIS lookups give you a snapshot, but real-time monitoring catches issues the moment they happen. ServiceAlert.ai monitors 695+ cloud services 24/7 and sends instant alerts via email, Slack, Teams, Google Chat, or Discord when outages or degradations occur.

View current incidents or get started with free monitoring.