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WhoisThisDomain vs GNU Inetutils: catalog facts
WhoisThisDomain	GNU Inetutils
Free Freeware from NirSoft, free to use and redistribute unmodified.	Free Free software under the GPL version 3 or later.
Windows	macOS, Linux, Command line
Chooses the WHOIS server automatically by TLD Batch lookups and name-and-extension combinations	Many standard network clients and servers in one package Includes ping, traceroute, whois and ifconfig
Only queries WHOIS servers on port 43, not web-based WHOIS Proxy authentication with a user name and password is not supported	Several included protocols such as telnet, rsh and rlogin are unencrypted Command-line only
Downloadable app	Downloadable app
Closed source	Open source
License: Freeware	License: GPL-3.0-or-later
No account needed	No account needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked October 1, 2026

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