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Who.is vs ViewDNS.info: catalog facts
Who.is	ViewDNS.info
Freemium Lookups are free; domain history reports and monitoring are paid services.	Freemium The web tools are free; API access and research data are sold on paid plans.
Web	Web
WHOIS, RDAP, DNS and IP lookups in one site Reverse nameserver lookup	Many DNS, WHOIS and IP tools in one place Historical data such as IP history and reverse WHOIS
Full domain history requires a paid report Monitoring is a premium service	Some features such as dark mode need an account API and data products are paid
Web application, Hosted service	Web application, Hosted service
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 23, 2026

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