Compare software

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

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