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IPNetInfo vs Whois.com Lookup: catalog facts
IPNetInfo	Whois.com Lookup
Free Freeware from NirSoft that may be redistributed free of charge.	Free Lookups are free on the website.
Windows	Web
Extracts IP addresses from pasted email headers Queries all five regional internet registries	Looks up both domain names and IP addresses Shows registrar, dates and nameservers in one result
Needs an internet connection and outgoing access to port 43 Official requirements list Windows 98 to Windows 10 only	Owner details depend on what the registry publishes and are often redacted
Downloadable app	Web application
Closed source	Closed source
License: Freeware	License not stated
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 September 23, 2026

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