With one API call for search terms such as a domain owner’s name, email address, phone number, postal address, etc., you will get a list of all the linked domains that contain the identifier.Get started
500 free API credits. No credit card required.
Discover all domain names associated with an individual or an organization. Find connections between various domains, individuals and organizations.
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.
You may search by specific attributes in the domain’s WHOIS record. For example, search by registrant email address or name.
Get consistently formatted and structured WHOIS information for easy comparison with your existing databases.
Get Current as well as Historic Reverse WHOIS data.
Your search term can be an exact or a fuzzy match. For example, you may search for any registrant name that starts with the term “John” or any registrant email address that contains the term “xyz.”
With regularly updated WHOIS data, you’re sure to get only the latest information.
Brand protection professionals can safeguard their crown jewels by alleviating potential trademark infringements with reverse WHOIS data. Reverse WHOIS API catches domain lookalikes or copycats.
Researchers can rely on Reverse WHOIS API in combination with a WHOIS history viewpoint to investigate and eventually thwart cybercrime. Meanwhile, integration into antimalware solutions can detect spam, malicious links, attack attempts, and other misdeeds.
Reverse WHOIS API helps payment processors, banks, and other financial institutions prevent transaction fraud. Website owners and administrators can use it to scout for legitimate business and partnership opportunities using the contact details that domain owners reveal in their WHOIS records.
Reverse WHOIS API or Reverse WHOIS Search is an investigation must-have for law enforcement agents who wish to map out attackers’ infrastructure. Find all domains, websites, IP addresses, and more details connected to a crime or criminal with the tool’s help.
Reverse WHOIS API benefits business owners on the lookout for expansion. Use it to find new customers, too, through the contact details you can get from the WHOIS database.
“WhoisXML API is amazing for checking out the historic registration information of a domain, pivoting to locate the alternate registrations with the same details and also my cyber investigations. The data proved very useful when investigating pig butchering scams and domains that host child abuse material.”
“Very useful for investigations, we can go back in history and see when domains were registered and who owned them at a certain time.”
“WhoisXML API builds out data sets that help users correlate attack infrastructure with related IP and WHOIS information.”
Our APIs are available in an enhanced version that offers better performance with a dedicated load balancer and a premium endpoint to enable faster throttling for large-scale API deployments.Learn more
WhoisXML API offers annual subscription packages for all of its APIs. Your number of queries determines how much you need to pay each month, giving you a chance to allocate resources if you’re on a tight budget.Learn more