🕵️♂️ Discover who a domain really talks to — with zero data leaving your browser.
3ptracer is a browser-first, privacy-focused reconnaissance tool that gives you deep visibility into third-party services used by any domain.
With 3ptracer, you can:
✅ Run comprehensive DNS analysis: Perform live DoH queries and fetch multiple record types (A, AAAA, MX, NS, TXT, CNAME)
✅ Dig into Certificate Transparency logs: Identify shadow subdomains and historical usage
✅ Detect service providers: Automatically spot CDNs, DNS providers, cloud hosting, email services, and security solutions
✅ Analyze security posture: Check for misconfigured DMARC/SPF/DMKIM, and general risk indicators
✅ Visualize the web of dependencies: Get CNAME mappings, service categories, subdomain discovery stats, and historical patterns
Why it stands out:
🧠 Works fully in the browser
🔐 No data leaves your machine
📡 Real-time DNS resolution and fingerprinting
🖥️ No API keys, no shared rate limits
🌐 Built for OSINT investigators, security teams, and curious developers
Check it out: https://cyfinoid.github.io/3ptracer/
Source Code: https://github.com/cyfinoid/3ptracer
This is just the beginning. Explore it, break it, and tell us what you’d like to see next.