Subdomain Discovery
This tool is connected to the internal API and ready to use.
Result
Subdomain Discovery
Subdomain Discovery
What does this tool do?
Subdomain Discovery finds publicly known subdomains of a domain. It evaluates Certificate Transparency data created by publicly issued TLS certificates.
What is it used for?
- Review publicly visible hosts belonging to your own domain
- Find forgotten test, development or administration subdomains
- Support security audits and asset inventory
Input
A domain without a path, for example plus23.org or tools.plus23.org.
Result
The result lists discovered names alphabetically. Each entry can be copied separately.
Important note
The list is not guaranteed to be complete. Only subdomains visible in public Certificate Transparency data are shown. Internal, uncertified or never publicly known subdomains may be missing.