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ICANN Lookup vs DomainTools Whois Lookup: catalog facts
ICANN Lookup	DomainTools Whois Lookup
Free Free public lookup service run by ICANN.	Freemium Basic lookups are free, with deeper history and reverse WHOIS research on paid plans.
Web	Web
Run by ICANN rather than a registrar or advertiser Uses RDAP instead of scraping WHOIS	Domain ownership and IP address history in one lookup Shows whether a domain is available or for sale
Only shows registration data, with no DNS or mail diagnostics	Free tier is limited Historical and reverse lookups are aimed at paying users
Web application	Web application
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.