Subdomain Finder

Discover subdomains of any domain to analyze domain structure, find hidden services, and enhance security testing with comprehensive subdomain enumeration.

About Subdomain Discovery

What are Subdomains?

Subdomains are part of a larger domain that can point to different servers or services. They help organize and structure websites and applications.

Common Subdomain Types

• www: Main website
• mail: Email services
• api: API endpoints
• admin: Administrative interfaces
• dev/staging: Development environments
• cdn: Content delivery networks

Security Implications

• Subdomains can expose additional attack surfaces
• Hidden services may have weaker security
• Subdomain takeover vulnerabilities
• Information disclosure through subdomains

Legal Notice: Only scan domains you own or have explicit permission to test. Unauthorized subdomain enumeration may violate terms of service or laws.