Crt.sh Search
Free online crt.sh helper for finding subdomains in certificate transparency logs.
networkFree & Private
FAQ
Why use crt.sh?▼
Certificate transparency logs often reveal subdomains that are not documented elsewhere.
Does it find hidden hosts?▼
It can reveal public subdomains from issued certificates and related domains.
Use Cases
Reconnaissance
Discover subdomains during security review
Brand Monitoring
Track certificates issued for related domains
Examples
Search Domain
Input:
example.com
Output:
https://crt.sh/?q=%25.example.com