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Subduer is a tool for passive reconnaissance, focusing on discovering subdomains for a given domain. It uses Playwright to scrape data from several online providers and generates wordlists and reports in .csv and .json formats.

bash install.sh
python3 subduer.py <domain> # Scanning a domain
python3 subduer.py <domain> --report # Scanning a domain and saving the reports

Subduer saves reports in following formats:

• subdomains_report_subduer_example.com.csv - CSV report
• subdomains_report_subduer_example.com.json - JSON report
• subdomains_report_subduer_example.com.txt - Newline separated wordlist

• VirusTotal
• Merklemap
• DnsDumpster
• crt.sh

The tool is pretty fast as it asynchronously runs collectors.

• When collector fails to retrieve the subdomains, it retries.
• If you abuse the service and get captcha, it is yours to solve in the opened Playwright browser. After solving the captcha, the tool will retry.
• If a source fails after specified amount of retries, the subduer will simply ignore that source and continue execution.