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Robtex vs Who.is: catalog facts
Robtex	Who.is
Free Lookups are free on the website.	Freemium Lookups are free; domain history reports and monitoring are paid services.
Web	Web
Many lookup types from one search page Covers AS numbers and AS macros as well as domains and IPs	WHOIS, RDAP, DNS and IP lookups in one site Reverse nameserver lookup
Web service only Research shows lookups rather than any monitoring or alerting	Full domain history requires a paid report Monitoring is a premium service
Web application	Web application, Hosted service
Closed source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 23, 2026

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