Find Every Subdomain,Instantly
Run comprehensive subdomain enumeration with DNS, certificates, search engines, and passive sources. Built for security researchers, SEOs, and growth teams who need reliable recon at scale.
What This Tool Does
Subdomain Finder enumerates all publicly visible subdomains for a given domain using passive sources (certificate transparency logs, search engines, DNS datasets) and optional active checks (DNS resolution, HTTP probing). The result is a deduplicated, validated list you can export for security testing, technical SEO, or asset inventory.
🔍 How Subdomain Enumeration Works
📊 Interpreting the Results
Use Cases for Security, SEO, and Marketing
Security & Pentest Recon
- • Map attack surface comprehensively
- • Prioritize high-value hosts for testing
- • Watch for new exposures and risks
- • Bug bounty subdomain discovery
SEO & Marketing Audits
- • Detect shadow microsites
- • Find staging hosts affecting SEO
- • Discover legacy subsites
- • Monitor brand presence online
IT & Asset Inventory
- • Maintain domain hygiene
- • Lifecycle management
- • Infrastructure mapping
- • Compliance monitoring
Frequently Asked Questions
What is subdomain enumeration?
The process of discovering all subdomains associated with a root domain using passive and active techniques. Our tool combines certificate transparency logs, DNS records, and other public sources to find subdomains.
Is active probing safe?
We use standard DNS/HTTP requests with sensible rate limits. Our probes are non-intrusive and follow responsible disclosure practices. Always ensure you have permission to scan target domains.
Do you detect subdomain takeover risks?
We flag common patterns (e.g., CNAME pointing to deprovisioned services) that may indicate takeover risks. However, always verify findings manually before taking action.
What data sources do you use?
Our subdomain finder uses certificate transparency logs, DNS records, reverse DNS lookups, web crawl data, and partner data sources to provide comprehensive subdomain discovery.
Need More SEO & Security Tools?
We have a complete suite of DNS and web analysis tools for comprehensive domain intelligence.
View All Tools →