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Notice: Possible deprecation of Whois services after January 28, 2025.

Notice: Possible deprecation of WHOIS services after January 28, 2025 for ICANN TLDs

ICANN is in the process of transitioning registries and registrars from using WHOIS to provide domain registration data to a replacement protocol, RDAP. This could happen as soon as January 28, 2025. In cases where registries and/or registrars turn off their Whois services, whois.domaintools.com can no longer provide updated WHOIS records. DomainTools is adding RDAP to our enterprise products, Iris Investigate, Iris Detect and the Iris Enrich API. Domain registration data will continue to be provided in those applications.

See this FAQ for more details on RDAP and how it will be integrated into Iris Investigate, Enrich and Detect.

Please contact us at memberservices@domaintools.com with any questions.

Reverse Whois

Discover the owner of a current or historical domain name. Just enter one or more unique identifiers (such as an individual's or a company's name, phone number, email address or physical address) and learn all the domain names they own or have ever owned.

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Example: memberservices@domaintools.com or “DomainTools, LLC” or “2101 4th Avenue”

How does this work?

A normal Whois Lookup starts with a single domain name and only returns one ownership record.

The Reverse Whois product by DomainTools works in the opposite direction.

You enter terms that describe a domain owner, like an email address or a company name, and we'll search Whois records for those terms. You'll get a list of domain names which have your search terms listed in their Whois record.

Professionals use DomainTools Reverse Whois to:

  • Prioritize brand enforcement activities
  • Submit effective UDRP filings
  • Build complete threat assessments of bad actors
  • Inventory corporate domains for due-diligence research and asset management

Need help? Contact us today at memberservices@domaintools.com.

Related Tools

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  • Actively monitor any domain owner and receive notification of all their ongoing activity.
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  • Bulk Parsed Whois
  • Submit a list of domain names, and receive a .csv file with parsed Whois records for the domains.
  • Whois History
  • Track the ownership history of any known domain name as far back as 1995.
  • Hosting History
  • View historical IP addresses, name servers, and registrars for any given domain name.