Subdomain Scanner
Subdomain Finder
Discover all active subdomains for any domain. Searches certificate transparency logs, then verifies each one with real DNS lookups and reverse DNS.
google.com
amazon.com
github.com
flyhost.in
microsoft.com
Resolving subdomains…
| # | Subdomain | IP Address | Reverse DNS |
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About This Tool
How Subdomain Finder Works
Our scanner searches certificate transparency logs, then verifies each subdomain with real DNS lookups.
Certificate Transparency
Searches crt.sh's public log of every SSL/TLS certificate ever issued for the domain to uncover real subdomains — not just guesses from a wordlist.
Reverse DNS
Performs reverse DNS lookup on each IP to reveal the hosting provider or server hostname.
Export Results
Download found subdomains as a CSV file or copy the list to clipboard for easy analysis.
Real Subdomains, Not Guesses
Since results come from actual issued certificates, it finds subdomains a wordlist would never guess — not just common ones like www, mail, or api.