Free tool
WHOIS lookup
Check who registered a domain, when it expires and which registrar and name servers it uses.
Look up a domain
Enter a domain without http:// or paths. Limit: 5 lookups per 30 minutes.
Registrar
The company the domain is registered through, and its contact for abuse reports.
Key dates
When the domain was created, last updated and when it expires.
Name servers
Which DNS servers the domain points to - often a hint at the host.