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IPNetInfo vs quien: catalog facts
IPNetInfo	quien
Free Freeware from NirSoft that may be redistributed free of charge.	Free Free and open source under the MIT licence.
Windows	Windows, Command line
Extracts IP addresses from pasted email headers Queries all five regional internet registries	WHOIS, DNS, mail, TLS and HTTP checks in one view Readable tabbed TUI instead of raw whois text
Needs an internet connection and outgoing access to port 43 Official requirements list Windows 98 to Windows 10 only	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.