Discover known subdomains associated with a domain, sourced from third-party certificate services
Each subdomain includes the date it was last observed, helping you gauge activity
WHOIS, DNS, Safety Check, and more to analyze a domain across multiple dimensions.
Frequently Asked Questions
What is a Subdomain Finder?
A subdomain finder discovers subdomains associated with a domain name by querying third-party certificate services. It lists known subdomains along with the date each was last seen, giving you a quick overview of a domain's known subdomains.
Why is a query sometimes slow?
Results are fetched live from third-party certificate services. During busy periods, or for domains with a very large number of subdomains, a query may take longer than usual or occasionally time out. If that happens, please wait a moment and try again.
Why might some subdomains be missing?
This tool finds subdomains that have been publicly observed. Subdomains that have never been exposed publicly will not appear. Internal-only subdomains typically are not publicly visible and so are not listed.
What does the "last seen" date mean?
The "last seen" date indicates when the subdomain was most recently observed publicly. A recent date suggests the subdomain is likely still active. An older date may indicate the subdomain is no longer in use.