Subdomain Finder
Discover subdomains using Certificate Transparency logs. Find all SSL-issued subdomains for security audits and reconnaissance.
Certificate Transparency
CT logs are public records of SSL certificates issued by Certificate Authorities. We query these logs to find all subdomains with SSL certificates.
Passive & Legal
This is a passive reconnaissance technique. We only query public databases - no active scanning or probing of target domains.
Security Audits
Perfect for discovering forgotten subdomains, shadow IT, and expanding your attack surface assessment during penetration testing.
What We Just Tested
We analyzed your TTL settings, DNSSEC configuration, and global propagation status to ensure your domain resolves correctly worldwide and can't be hijacked through DNS poisoning attacks.
How GoZen Automates This
GoZen Premium DNS uses Anycast technology across 5 continents. Changes propagate globally in under 30ms with automatic DNSSEC signing and 100% uptime SLA.
Learn more about GoZen DNSWhat We Just Tested
We analyzed your TTL settings, DNSSEC configuration, and global propagation status to ensure your domain resolves correctly worldwide and can't be hijacked through DNS poisoning attacks.
How GoZen Automates This
GoZen Premium DNS uses Anycast technology across 5 continents. Changes propagate globally in under 30ms with automatic DNSSEC signing and 100% uptime SLA.
Learn more about GoZen DNS