Compare software

DomainTools Whois LookupDNSlytics
Freemium

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

 Freemium

Free tools on the website; premium website access, monitoring and the API are paid monthly…

Web Web
  • Domain ownership and IP address history in one lookup
  • Shows whether a domain is available or for sale
  • Reverse IP, name server and mail server lookups in one place
  • More than ten years of historical DNS data
  • Free tier is limited
  • Historical and reverse lookups are aimed at paying users
  • Page views and features are limited without a premium plan
  • IP and DNS data is refreshed every 14 days rather than live
Web application 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

Checked September 23, 2026

Checked October 1, 2026

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