Registrant Alert Overview | WhoisXML API

Find out which domains were added or dropped by registrants, with given search criteria

Search across all registered and dropped domain names for the registrant's specific details.

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500 free API requests. No credit card required.

774 Million+Domains tracked
16.7 Billion+WHOIS records
7,596+TLDs and ccTLDs tracked
52,000+Satisfied customers

Registrant Alert product line includes


Just take a registrant’s info, such us name, email, phone, address, etc. to search across all registered and dropped domain names for the registrant's specific details.

Registrant Alert Lookup | WhoisXML API
Registrant Alert API | WhoisXML API


Registrant Alert API is ideal for monitoring specific domain registrants to be alerted whenever their information is linked to a newly-registered or just-expired domain name.


  • Precise

    Helps you set up program to receive notifications whenever specified individuals or organizations register or delete domains.You can backtrack the alerts by setting the sinceDate request parameter.

  • Catchall

    The Registrant Alert API searches new .com, .net, .org, .biz, .mobi, .us, .pro, .coop, .asia and thousands of gTLDs and ccTLDs for your specified registrant or terms.

  • Flexible

    Search results can be filtered based on registration or expiration date. For example, if you want records only within the last year, you can do that.

  • Up-to-date

    By default, the result contains all the domain names registered or dropped on the most recent day. Your program can monitor each set of terms by submitting a single query each day.

Practical usage

Protect Against Cybersquatting

Protect your or your customers' domains against abuse by keeping an eye out on domain registrants known for cybersquatting. Using their names or other registrant details as search criteria can help you stay abreast of their moves, especially if they register look-alikes of your domains.

Monitor Your Competitors

Keep track of your competitors’ business moves. The domains they recently acquired could signify a new product/service launch, an ongoing merger and acquisition (M&A), or a new company launch. Use their registrant’s name as a Registrant Alert monitoring term to get automated notifications.

Build Up Your Domain Portfolio

Use your favorite domain registrant’s name as a monitoring term to get notified as soon as lucrative-looking domains get dropped.

Registrant Alert Overview | WhoisXML API

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