SecurityTrails charges $50+/mo for this

    Associated Domains Discovery

    Find domains related to any target through shared infrastructure — same IP, SSL certificates, mail servers, and nameservers. Essential for reconnaissance, brand protection, and vendor assessment.

    What We Discover

    Domains hosted on the same IP address
    Domains in SSL certificates & CT logs
    Domains sharing mail infrastructure
    Domains using the same nameservers

    Use Cases

    Reconnaissance & penetration testing
    Brand protection & shadow IT discovery
    Vendor & supply chain risk assessment
    Competitive intelligence gathering