Ctf Osint

This is a comprehensive OSINT reference built for CTF competitions, packed with one-liners and deep-dive guides across three supporting files. You get quick commands for DNS recon, reverse image search, username enumeration, Twitter/X tracking via Snowflake IDs, geolocation techniques including Street View panorama matching, Google dorking with TBS filters, Tor relay lookups, and even Unicode homoglyph steganography. The skill knows when to pivot to forensics or web exploitation tools. What stands out is the specificity: it covers edge cases like Baidu reverse image search for China, reflected text reading, MGRS coordinate conversion, and FEC political donation research. If you're doing intelligence gathering challenges, this replaces a dozen browser tabs.

skills.sh installs: 9.8K
GitHub stars: 3.7K
last updated: Aug 21, 2026

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Install

$ npx -y skills add ljagiello/ctf-skills --skill ctf-osint --agent claude-code

Installs into .claude/skills of the current project.

Files

CTF OSINT

Quick reference for OSINT CTF challenges. Each technique has a one-liner here; see supporting files for full details.

Prerequisites

Python packages (all platforms):

pip install shodan Pillow

Linux (apt):

apt install whois dnsutils nmap libimage-exiftool-perl imagemagick curl

macOS (Homebrew):

brew install whois bind nmap exiftool imagemagick curl

MCP servers (optional): Playwright MCP (microsoft/playwright-mcp) for browser-driven OSINT (JS-rendered pages, reverse-image/map flows) — see tools-mcp.md.