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Whois.com Lookup vs WhoisThisDomain: catalog facts
Whois.com Lookup	WhoisThisDomain
Free Lookups are free on the website.	Free Freeware from NirSoft, free to use and redistribute unmodified.
Web	Windows
Looks up both domain names and IP addresses Shows registrar, dates and nameservers in one result	Chooses the WHOIS server automatically by TLD Batch lookups and name-and-extension combinations
Owner details depend on what the registry publishes and are often redacted	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
No account needed	No account needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 8, 2026

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