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Who.is vs IP Lookup: catalog facts
Who.is	IP Lookup
Freemium Lookups are free; domain history reports and monitoring are paid services.	Free Free and open source under the GPL.
Web	Linux
WHOIS, RDAP, DNS and IP lookups in one site Reverse nameserver lookup	Simple single-purpose interface Adaptive layout for Linux phones
Full domain history requires a paid report Monitoring is a premium service	Linux only Limited to IP information lookups
Web application, Hosted service	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0-or-later
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 October 1, 2026

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