Individual skill
recon-a-domain-passively
End-to-end passive reconnaissance for a domain, website or IP — builds an asset inventory covering registration, DNS, subdomains, infrastructure, tech stack, history and ownership without sending a single packet to the target. Use when asked to research or profile a domain or website, map what an organisation runs, or investigate a suspicious site without alerting its operator. Applies to vendor and third-party risk assessment, attack-surface review, M&A technical diligence, phishing and fraud-site investigation, and pre-engagement scoping. Reference at useosint.com/skills/recon-a-domain-passively.
skills/recon-a-domain-passively/SKILL.md
Source commit 06243a5620b0c9c97502edd4ee9e31995a3bdccd
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- Last checked
- Nov 6, 2026
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- Repository last updated
- Aug 3, 2026
- License
- MIT
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# Recon a domain passively
Turn one domain into a defensible map of an organization's internet-facing estate
plus the owner behind it. The techniques live in other skills; what this workflow
contributes is the **order**, the **inventory**, and the **stopping rule**. Two
failure modes to avoid from the start: enumerating for hours and producing 400
hostnames with no attribution, dates or priority, which is not a map; and drifting
active without noticing, because one probe "just to check if it's up" ends the
passive claim. Decide the passive boundary before step 2, not during it.
## Ordering logic
Each stage feeds the next, and the sequence is cheapest-and-quietest first:
