Compare software

WhoisThisDomain vs Who.is: catalog facts
WhoisThisDomain	Who.is
Free Freeware from NirSoft, free to use and redistribute unmodified.	Freemium Lookups are free; domain history reports and monitoring are paid services.
Windows	Web
Chooses the WHOIS server automatically by TLD Batch lookups and name-and-extension combinations	WHOIS, RDAP, DNS and IP lookups in one site Reverse nameserver lookup
Only queries WHOIS servers on port 43, not web-based WHOIS Proxy authentication with a user name and password is not supported	Full domain history requires a paid report Monitoring is a premium service
Downloadable app	Web application, Hosted service
Closed source	Closed source
License: Freeware	License not stated
No account needed	Not stated if an account is needed
Needs internet	Needs internet
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked September 23, 2026

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