Subdomain Discovery Tool
Discover subdomains to ensure that your entire external attack surface is mapped and secured.
Know your external attack surface area
One of the biggest challenges in cybersecurity is keeping track of all the assets in the business. Many hacks happen not through highly sophisticated attacks and zero-day vulnerabilities, but by exploiting forgotten and misconfigured assets.
Subdomains is one common vector for attackers to exploit. After gaining access to a subdomain, attackers can potentially access cookies set from the root domain, set up cross-site scripting exploits, or bypass security policies.
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HostedScan is a best-in-class tool for EASM and external vulnerability scanning
How does subdomain discovery work?
DNS providers are the authoritative source for all subdomains. However, many subdomains can also be discovered through public data sources. One widely used data source is Certificate Transparency Logs, which are generated by certificate authorities when they issue TLS certificates. While these data sources will not always contain all subdomains, they will show which subdomains can be easily found by anyone in the world.
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