Active and Passive SSL Discovery

CertificateGuardian uses a dual discovery approach to map your organizational certificate footprint.

Active Scanning (Probing)

Our active scanner resolves your configured target domains and initiates connection probes to retrieve active cert data:

• Port Auditing: Audits standard HTTPS (443) and secondary ports (e.g., 8443, 9443).
• SSRF Safety: All scans pass through our loopback filtration layer to block unauthorized internal network probing.

Passive Scanning (Certificate Transparency logs)

We monitor live global Certificate Transparency (CT) feeds to find newly issued certificates for your domains:

• Rogue Cert Detection: Detects if a CA issues a certificate for your domains without authorization.
• Subdomain Discovery: Automatically appends newly discovered subdomains to your inventory draft.