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Who.is vs Domain Locker: catalog facts
Who.is	Domain Locker
Freemium Lookups are free; domain history reports and monitoring are paid services.	Free Open source under MIT for self-hosting; hosted pricing is not stated in the research.
Web	Web, Self-hosted
WHOIS, RDAP, DNS and IP lookups in one site Reverse nameserver lookup	Tracks domains from many registrars in one place Expiry and change alerts through many channels
Full domain history requires a paid report Monitoring is a premium service	Most useful only for people managing several domains Some features such as widgets are listed as coming soon
Web application, Hosted service	Self-hosted, Hosted service
Closed source	Open source
License not stated	License: MIT
Not stated if an account is needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 2, 2026

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