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DomainTools Whois Lookup vs Who.is: catalog facts
DomainTools Whois Lookup	Who.is
Freemium Basic lookups are free, with deeper history and reverse WHOIS research on paid plans.	Freemium Lookups are free; domain history reports and monitoring are paid services.
Web	Web
Domain ownership and IP address history in one lookup Shows whether a domain is available or for sale	WHOIS, RDAP, DNS and IP lookups in one site Reverse nameserver lookup
Free tier is limited Historical and reverse lookups are aimed at paying users	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.