Slash Mark - Subdomain Finder

Quickly scan common subdomains of the active tab's domain using DNS-over-HTTPS.

This extension helps security researchers, developers, and power users quickly identify subdomains belonging to the website currently open in the browser. With a single click, it performs a fast DNS-over-HTTPS scan to detect commonly used subdomains and potential hidden assets linked to the active domain. Results appear instantly in a clean and organized interface, making it easy to analyze a site’s online footprint. Designed for efficiency, privacy, and accuracy, the tool performs all lookups securely without exposing browsing activity. Ideal for reconnaissance, bug bounty workflows, and domain analysis during everyday web exploration