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Subdomain Finder

Guide: how to use

Step-by-step instructions in the blog

Subdomain Finder

Discover subdomains for any domain using public records and certificates. CyberTools browser utility — no install.

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The Subdomain Finder is a powerful reconnaissance tool designed for security researchers and website owners. It identifies subdomains associated with a target domain by querying massive public data sources, including certificate transparency logs (crt.sh) and DNS aggregators. This tool helps you map a domain's attack surface, find hidden development environments, and ensure all your digital assets are properly secured.

FAQ

What does Subdomain Finder do?

Discover subdomains for any domain using public records and certificates. CyberTools browser utility — no install.

Is Subdomain Finder free?

Subdomain Finder runs free in the browser on CyberTools for typical one-off tasks — no install required.

Where is the how-to guide for Subdomain Finder?

Open the guide — step-by-step help on the blog; unlock above for the interactive UI.

More tools in Network Tools?

Network Tools — category hub with sibling free tools (no captcha to browse).

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