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WhoisThisDomain vs quien: catalog facts
WhoisThisDomain	quien
Free Freeware from NirSoft, free to use and redistribute unmodified.	Free Free and open source under the MIT licence.
Windows	Windows, Command line
Chooses the WHOIS server automatically by TLD Batch lookups and name-and-extension combinations	WHOIS, DNS, mail, TLS and HTTP checks in one view Readable tabbed TUI instead of raw whois text
Only queries WHOIS servers on port 43, not web-based WHOIS Proxy authentication with a user name and password is not supported	Terminal only Young project from a single developer
Downloadable app	Downloadable app
Closed source	Open source
License: Freeware	License: MIT
No account needed	No account needed
Needs internet	Needs internet
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked October 2, 2026

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