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ICANN Lookup vs Who.is: catalog facts
ICANN Lookup	Who.is
Free Free public lookup service run by ICANN.	Freemium Lookups are free; domain history reports and monitoring are paid services.
Web	Web
Run by ICANN rather than a registrar or advertiser Uses RDAP instead of scraping WHOIS	WHOIS, RDAP, DNS and IP lookups in one site Reverse nameserver lookup
Only shows registration data, with no DNS or mail diagnostics	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
Not stated if an account is needed	Not stated if an account is needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

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