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DomainTools Whois LookupRobtex
Freemium

Basic lookups are free, with deeper history and reverse WHOIS research on paid plans.

 Free

Lookups are free on the website.

Web Web
  • Domain ownership and IP address history in one lookup
  • Shows whether a domain is available or for sale
  • Many lookup types from one search page
  • Covers AS numbers and AS macros as well as domains and IPs
  • Free tier is limited
  • Historical and reverse lookups are aimed at paying users
  • Web service only
  • Research shows lookups rather than any monitoring or alerting
Web application Web application
Closed source Closed source
License not stated License not stated
Not stated if an account is needed No account needed
Needs internet Needs internet

Checked September 23, 2026

Checked September 24, 2026

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