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find-hidden-subdomains

75 / 100 · Review before installing

Check before installing. Some of what it can do is expected: a coding skill usually runs build and test commands.

By tonydzi/second-brain-starter-kit (GitHub) · coding · 15 stars · scanned at commit 552cc75

- Enumerate an organisation's subdomains and sibling domains from Certificate Transparency logs and passive DNS, without sending traffic to the target. Use when looking for staging, dev, admin or VPN hosts, mapping the full hostname footprint of a domain, or spotting infrastructure a company forgot it had

Works with any agent that supports SKILL.md skills.

What this skill can do

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Install

Paste this into your terminal. It downloads exactly the version we scanned, not whatever is newest.

if [ -e ~/.agents/skills/'find-hidden-subdomains' ] || [ -L ~/.agents/skills/'find-hidden-subdomains' ]; then echo 'A skill folder named find-hidden-subdomains already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/tonydzi/second-brain-starter-kit' "$d" && git -C "$d" checkout --quiet '552cc7596c295452c208713bf5fa3c75d826f189' -- 'skills/find-hidden-subdomains' && mkdir -p ~/.agents/skills && cp -R "$d"/'skills/find-hidden-subdomains' ~/.agents/skills/'find-hidden-subdomains' && rm -rf "$d"; fi

Codex reads ~/.agents/skills directly. For Claude Code, Cursor, Copilot, Gemini CLI, Antigravity or OpenCode, also link it. For Claude Code: ln -s ~/.agents/skills/'find-hidden-subdomains' ~/.claude/skills/'find-hidden-subdomains' (other agents: ~/.cursor/skills, ~/.copilot/skills, ~/.gemini/skills, ~/.gemini/config/skills, ~/.config/opencode/skills). Or install through the finder skill, which does both.

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