Recon A Domain Passively

Q: What is a Claude Code skill and how does the Recon A Domain Passively skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Recon A Domain Passively is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: Security · Sub-category: security-misc · Last updated: 2026-09-28

type:review

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.

Security AStatic scan found no risk patternsHow grading works ›

From the source SKILL.md

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.

What this skill does

Recon A Domain Passively is a community-contributed Claude Code skill in the security-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/recon-a-domain-passively/ and loads when your prompt matches the skill's trigger.

When to invoke it: 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.

Who uses this skill

The Recon A Domain Passively Claude Code skill is built for security engineers, penetration testers, DevSecOps practitioners, and development teams hardening codebases and infrastructure. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 213,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/recon-a-domain-passively
curl -L https://claudskills.com/skills/recon-a-domain-passively/SKILL.md \
  -o ~/.claude/skills/recon-a-domain-passively/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/recon-a-domain-passively/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/recon-a-domain-passively/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\recon-a-domain-passively\SKILL.md on Windows. See the full install guide for step-by-step instructions.

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Recon A Domain Passively Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/recon-a-domain-passively/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.

What does the Recon A Domain Passively skill do?

Is this skill free to install?

Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.

When should I use the Recon A Domain Passively skill?

Use Recon A Domain Passively when your Claude Code task falls under the Security category — specifically in the security misc area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Recon A Domain Passively" or describe the task and let Claude pick). Browse related skills at /category/security/.

What is a Claude Code skill and how does the Recon A Domain Passively skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Recon A Domain Passively is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Source: https://github.com/UseOSINT/Skills/blob/HEAD/skills/recon-a-domain-passively/SKILL.md
License: MIT
Author: UseOSINT
Website: https://www.skills.sh/useosint/osint-skills

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA

UseOSINT. (2026). Recon A Domain Passively [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/recon-a-domain-passively/

BibTeX

@misc{recon-a-domain-passively-2026,
  author    = {UseOSINT},
  title     = {Recon A Domain Passively [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/recon-a-domain-passively/}
}

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Badge

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Security scan

Grade A · scanned 2026-11-01 — free static scan against the OWASP Agentic Skills Top 10.

The scan flagged 1 of 10 categories (filesystem), including lower-severity patterns. Patterns shown inside code fences are weighted as examples rather than instructions — read the grading methodology for what this does and does not guarantee.

✓ Prompt injection
✓ Data exfiltration
✓ Supply chain
✓ Reverse shell
✓ Credentials
✓ Execution
⚠ Filesystem
✓ Persistence
✓ Obfuscation
✓ Network

Show this grade on your repo (click to copy):

[![Security: A](https://img.shields.io/badge/Security-A-2e7d32)](https://claudskills.com/skills/recon-a-domain-passively/#security)

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Browse all Security skills → Top 100 skills

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