Active Probing & Surface
low Severity
Free Check
Subdomain Exposure & Enumeration
Discovers active subdomains via Certificate Transparency logs and DNS resolution to map your external attack surface.
Why It Matters
Unmonitored development, test, and staging subdomains often run outdated software without proper firewall defenses.
How We Check This
We aggregate domain records from Certificate Transparency logs, crt.sh, and common hostname lookups.
How to Fix & Implement
Copy-paste configuration blocks tailored for your web server or edge proxy.
nginx snippet
# Decommission or place unused subdomains behind an authentication proxy
Frequently Asked Questions
How do scanners find subdomains without brute force?
Every time an SSL certificate is generated, the domain is recorded publicly in Certificate Transparency logs.