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WhoisCL vs WhoisThisDomain: catalog facts
WhoisCL	WhoisThisDomain
Free Freeware from Nir Sofer.	Free Freeware from NirSoft, free to use and redistribute unmodified.
Windows, Command line	Windows
Selects a WHOIS server based on the domain extension Supports custom servers and SOCKS4 or SOCKS5 proxies	Chooses the WHOIS server automatically by TLD Batch lookups and name-and-extension combinations
Windows only Requires an internet connection and WHOIS access on port 43	Only queries WHOIS servers on port 43, not web-based WHOIS Proxy authentication with a user name and password is not supported
Downloadable app	Downloadable app
Closed source	Closed source
License: Freeware	License: Freeware
Not stated if an account is 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 8, 2026

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