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IPNetInfo vs Robtex: catalog facts
IPNetInfo	Robtex
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	Many lookup types from one search page Covers AS numbers and AS macros as well as domains and IPs
Needs an internet connection and outgoing access to port 43 Official requirements list Windows 98 to Windows 10 only	Web service only Research shows lookups rather than any monitoring or alerting
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 24, 2026

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