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performing-subdomain-enumeration-with-subfinder

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Enumerate subdomains of target domains using ProjectDiscovery's Subfinder passive reconnaissance tool to map the attack surface during security assessments.

skills/performing-subdomain-enumeration-with-subfinder/SKILL.md

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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

## Prerequisites
- Go 1.21+ installed for building from source
- Subfinder v2 installed (`go install -v github.com/projectdiscovery/subfinder/v2/cmd/subfinder@latest`)
- API keys configured for passive sources (Shodan, Censys, VirusTotal, SecurityTrails, Chaos)
- Provider configuration file at `$HOME/.config/subfinder/provider-config.yaml`
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