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From a casual gaming project at NASA's JPL to powering 700+ cybersecurity vendors, WhoisXML API has become the foundation of modern threat intelligence. In this episode of Ahead of the Breach, recorded at RSA Conference 2025, Casey sits down with Vice President Alex Ronquillo to explore how domain registration data has become critical infrastructure for security tools and how penetration testers can leverage this intelligence in their work.
Alex takes us behind the scenes of the massive data collection operation that tracks billions of domain events monthly, explaining how even the most heavily reviewed security tools rely on WhoisXML API to identify potentially malicious domains based on registration patterns. He also reveals surprising research showing that 90% of subdomains in security databases don't actually exist — they're artifacts of security scanning against wildcard DNS configurations that respond to any query.
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From a casual gaming project at NASA's JPL to powering 700+ cybersecurity vendors, WhoisXML API has become the foundation of modern threat intelligence. In this episode of Ahead of the Breach, recorded at RSA Conference 2025, Casey sits down with Vice President Alex Ronquillo to explore how domain registration data has become critical infrastructure for security tools and how penetration testers can leverage this intelligence in their work.
Alex takes us behind the scenes of the massive data collection operation that tracks billions of domain events monthly, explaining how even the most heavily reviewed security tools rely on WhoisXML API to identify potentially malicious domains based on registration patterns. He also reveals surprising research showing that 90% of subdomains in security databases don't actually exist — they're artifacts of security scanning against wildcard DNS configurations that respond to any query.
Topics discussed:
Listen to more episodes:
Apple
Spotify