WhoDNS

Subdomain Finder

Finds a domain's active subdomains by DNS-probing a list of common names.

Frequently Asked Questions

What is a subdomain?
A subdomain is the part before the main domain, like mail.example.com or blog.example.com, usually pointing to a separate service or section.
How does this tool find subdomains?
By DNS-probing a list of common names (like www, mail, api, dev, cpanel) and listing those that resolve. It only reveals publicly visible subdomains.
If none are found, do none exist?
Not necessarily; the tool only tries common names. Subdomains with unusual names may not be in this list.