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IPNetInfo vs Who.is: catalog facts
IPNetInfo	Who.is
Free Freeware from NirSoft that may be redistributed free of charge.	Freemium Lookups are free; domain history reports and monitoring are paid services.
Windows	Web
Extracts IP addresses from pasted email headers Queries all five regional internet registries	WHOIS, RDAP, DNS and IP lookups in one site Reverse nameserver lookup
Needs an internet connection and outgoing access to port 43 Official requirements list Windows 98 to Windows 10 only	Full domain history requires a paid report Monitoring is a premium service
Downloadable app	Web application, Hosted service
Closed source	Closed source
License: Freeware	License not stated
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 September 23, 2026

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