Subdomain Scanner Tool

    Discover publicly accessible subdomains for any domain using DNS records and public data.

    Enter a domain name above and click Scan Subdomains to see results

    About This Tool

    What is Subdomain Scanner Tool?

    Discover publicly accessible subdomains for any domain using DNS records and public data.

    Frequently Asked Questions

    What are subdomains?

    Subdomains are divisions of your main domain that can point to different websites or sections of your website. For example, 'blog.example.com' and 'shop.example.com' are subdomains of 'example.com'. They allow you to organize and separate different functions or sections of your online presence.

    How does subdomain scanning work?

    Our subdomain scanner uses various techniques including DNS zone transfers (when permitted), public certificate transparency logs, web crawling results, and common subdomain dictionary attacks to discover publicly accessible subdomains. It only finds subdomains that are publicly known through legitimate sources.

    Why would I need to scan for subdomains?

    Common reasons include security audits (finding forgotten subdomains that might be vulnerable), competitive research, site architecture review, and ensuring all your subdomains are properly secured and monitored. It's an important part of understanding your complete web presence.