Individual skill
performing-subdomain-enumeration-with-subfinder
Enumerate subdomains of target domains using ProjectDiscovery's Subfinder passive reconnaissance tool to map the attack surface during security assessments.
internal/tools/skills/data/web-application-security/performing-subdomain-enumeration-with-subfinder/SKILL.md
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- Last checked
- Nov 7, 2026
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- Repository last updated
- Nov 7, 2026
- License
- Apache-2.0
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- cybersecurity Repository topic
- security Repository topic
- bug-bounty Repository topic
- automation Repository topic
- autonomous-pentesting Repository topic
- ai-agent Repository topic
- ai-security Repository topic
- ethical-hacking Repository topic
- golang Repository topic
- penetration-testing Repository topic
- subdomain-enumeration Declared skill tag
- reconnaissance Declared skill tag
- bug-bounty Declared skill tag
- attack-surface Declared skill tag
- subfinder Declared skill tag
- passive-recon Declared skill tag
- osint Declared skill tag
- security Derived category
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# Performing Subdomain Enumeration with Subfinder
## When to Use
- During the reconnaissance phase of penetration testing or bug bounty hunting
- When mapping the external attack surface of a target organization
- Before performing vulnerability scanning on discovered subdomains
- When building an asset inventory for continuous security monitoring
- During red team engagements requiring passive information gathering
## Coverage Gaps & Validation
- **Subfinder alone is passive-only** — combine it with active brute-force/permutation tooling or you will miss internal-only and never-logged names. Run `subfinder -all` AND `amass enum -active`, then add brute force: `puredns bruteforce wordlist.txt example.com -r resolvers.txt` and permutations: `gotator -sub subs.txt -perm permutations.txt | puredns resolve`.
- **Wire up API keys** — without Shodan/Censys/VirusTotal/SecurityTrails/Chaos/GitHub keys, passive sources return a fraction of results. An empty `provider-config.yaml` is the #1 cause of false "no subdomains" conclusions.
- **Mine certificate transparency directly** — `curl -s 'https://crt.sh/?q=%25.example.com&output=json' | jq -r '.[].name_value' | sort -u` and the `ctfr`/`tls.bufferover.run` sources catch names CDN-fronted tools miss.