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subdomain-enumeration

Multi-source subdomain discovery combining passive (CT, aggregators) and active (DNS brute-force) techniques with takeover assessment

internal/tools/skills/data/reconnaissance/subdomain-enumeration/SKILL.md

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Nov 7, 2026
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# Subdomain Enumeration

## When to Use
When the target is a domain (not a raw IP) and the scan methodology includes subdomain discovery. Skip when explicitly targeting a single host or when the scan mode says subdomain enumeration is not required.

## Methodology

### Passive Discovery (No Target Contact)
```bash
# Certificate Transparency
curl -s "https://crt.sh/?q=%25.TARGET&output=json" | jq -r '.[].name_value' | sort -u > tmp/ct_subs.txt

# DNS aggregators (passive, no rate impact on target)
subfinder -d TARGET -all -recursive -o tmp/subs_subfinder.txt 2>/dev/null