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WhoisThisDomain vs WhoisCL: catalog facts
WhoisThisDomain	WhoisCL
Free Freeware from NirSoft, free to use and redistribute unmodified.	Free Freeware from Nir Sofer.
Windows	Windows, Command line
Chooses the WHOIS server automatically by TLD Batch lookups and name-and-extension combinations	Selects a WHOIS server based on the domain extension Supports custom servers and SOCKS4 or SOCKS5 proxies
Only queries WHOIS servers on port 43, not web-based WHOIS Proxy authentication with a user name and password is not supported	Windows only Requires an internet connection and WHOIS access on port 43
Downloadable app	Downloadable app
Closed source	Closed source
License: Freeware	License: Freeware
No account needed	Not stated if an account is 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.