Reconnaissance

Subdomain finder

Discover published subdomains of a domain from public certificate transparency records. This is a passive query: no scanning is performed against the domain.

Free, no sign-up or install
We never store your data or your queries
Secure lookups from our own server

Responsible use

Use these tools only on domains, addresses or credentials you own or are expressly authorised to assess. Their use is the sole responsibility of the person using them.