WhoisXML API

WhoisXML API is a comprehensive data service that provides access to domain, IP, DNS, and cybersecurity intelligence. It offers a suite of APIs and data feeds that deliver current and historical WHOIS records, DNS information, IP geolocation data, and threat intelligence. You can use it to find out who owns a domain, where a website is hosted, and identify potential security risks associated with specific web properties.

The service works through a well-documented API that developers can integrate into their applications, as well as web-based lookup tools and downloadable databases for bulk analysis. It stands out for the breadth of its data coverage, offering not just basic WHOIS lookups but also specialized services like reverse WHOIS searches, brand monitoring alerts, and predictive threat feeds that flag malicious domains early.

This tool is most valuable for cybersecurity teams investigating threats, IT professionals managing network security, and market researchers analyzing digital assets. Real-world use cases include identifying phishing campaign infrastructure, tracking competitor domain portfolios, verifying the legitimacy of user-provided email addresses, and monitoring for unauthorized use of company trademarks in new domain registrations.