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