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IP Lookup vs Robtex: catalog facts
IP Lookup	Robtex
Free Free and open source under the GPL.	Free Lookups are free on the website.
Linux	Web
Simple single-purpose interface Adaptive layout for Linux phones	Many lookup types from one search page Covers AS numbers and AS macros as well as domains and IPs
Linux only Limited to IP information lookups	Web service only Research shows lookups rather than any monitoring or alerting
Downloadable app	Web application
Open source	Closed source
License: GPL-3.0-or-later	License not stated
No account needed	No account needed
Needs internet	Needs internet
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 24, 2026

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