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ICANN LookupWhoisThisDomain
Free

Free public lookup service run by ICANN.

 Free

Freeware from NirSoft, free to use and redistribute unmodified.

Web Windows
  • Run by ICANN rather than a registrar or advertiser
  • Uses RDAP instead of scraping WHOIS
  • Chooses the WHOIS server automatically by TLD
  • Batch lookups and name-and-extension combinations
  • Only shows registration data, with no DNS or mail diagnostics
  • Only queries WHOIS servers on port 43, not web-based WHOIS
  • Proxy authentication with a user name and password is not supported
Web application Downloadable app
Closed source Closed source
License not stated License: Freeware
Not stated if an account is needed No account needed
Needs internet Needs internet

Checked September 23, 2026

Checked October 8, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.