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Robtex vs IPNetInfo: catalog facts
Robtex	IPNetInfo
Free Lookups are free on the website.	Free Freeware from NirSoft that may be redistributed free of charge.
Web	Windows
Many lookup types from one search page Covers AS numbers and AS macros as well as domains and IPs	Extracts IP addresses from pasted email headers Queries all five regional internet registries
Web service only Research shows lookups rather than any monitoring or alerting	Needs an internet connection and outgoing access to port 43 Official requirements list Windows 98 to Windows 10 only
Web application	Downloadable app
Closed source	Closed source
License not stated	License: Freeware
No account needed	No account needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 8, 2026

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