Provide current and historical ownership information on domains / IPs. Identify all connections between domains, registrants, registrars, and DNS servers.
Look into all current and historical DNS / IP connections between domains and A, MX, NS, and other records. Monitor suspicious changes to DNS records.
Get detailed context on an IP address, including its user’s geolocation, time zone, connected domains, connection type, IP range, ASN, and other network ownership details.
Access our web-based solution to dig into and monitor all domain events of interest.
Get access to a web-based enterprise-grade solution to search and monitor domain registrations and ownership details for branded terms, fuzzy matches, registrants of interest, and more.
Detect and block access to and from dangerous domain names before malicious actors can weaponize them. Contact us today for more information.
Unlock integrated intelligence on Internet properties and their ownership, infrastructure, and other attributes.
Our complete set of domain, IP, and DNS intelligence available via API calls as an annual subscription with predictable pricing.
Offers complete access to WHOIS, IP, DNS, and subdomain data for product enrichment, threat hunting and more.
Enjoy priority data access with our premium API services topped with extra perks including dedicated team support, enterprise-grade infrastructure, and SLAs for full scalability and high performance.
Multi-Level API User Administration Now Available - Manage individual API keys for team members in your organization.
Learn MoreWith one API call, for search terms such as a domain owner’s name, email address, phone number, or postal address, you will get a list of all the linked domains that contain the identifier.
Get started500 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.
Result options include popularly used Extensible Markup Language (XML) and JavaScript Object Notation (JSON).
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.
“Whois XML is one of the most important tools we use for domain intelligence in the Bachelor's Degree program in Investigation and Security Sciences at the University of Perugia. In particular, we appreciate the reverse research from IP to Domain and Whois with query filters. The tool is comprehensive, providing detailed information such as phone numbers, names, and other details from Whois records. While many Whois records are now covered by privacy regulations, WhoisXML API provides access to all historical WHOIS records.”
“WhoisXML was the game changer for us. It has revolutionized our ability to disrupt cybercrime in process and at scale by quickly identifying all of the vendors providing material support for scammers using sophisticated website templates that look legitimate. By quickly identifying the vendors unknowingly supporting the criminals, we can provide them with public interest justification to burn down the criminal infrastructure.”
“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 moreWhoisXML 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 moreGet free access to our API. 500 free credits. No credit card required.
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