Realtime Certificate Transparency Log Streamer

certdrip-go is a real-time domain stream service powered by Certificate Transparency Logs.
It collects newly issued SSL/TLS certificates and streams extracted domain names over WebSocket, supporting use cases such as:

• Reconnaissance and bug bounty automation
• Threat intelligence pipelines
• OSINT domain monitoring
• Passive DNS & subdomain collection

👉 Give us a ⭐️ on GitHub!

Architecture Diagram

---

🔍 Web UI Preview

If you prefer a browser-based view, certdrip-go also includes a minimal Web UI to view real-time domains as they appear:

---

Features

• Fetches active CT logs dynamically from Chrome’s official log list
• Concurrent polling of multiple CT logs (via goroutines)
• Real-time WebSocket endpoint (/ws)
• Minimalist Web UI on port 8081
• Domain deduplication with time-based cache
• Rate reporting (domains per second)
• Filters out empty or intermediate certificates

---

How It Works

1. Fetch usable CT logs from log_list.json
2. Each log is polled in a dedicated goroutine
3. Parsed certificates yield Common Name or SAN domains
4. Results are sent to:
   • Console (stdout)
   • WebSocket (ws://localhost:8080/ws)
   • Web UI (http://localhost:8081)
5. Duplicate domains are cached for 5 minutes (configurable)

---

Requirements

• Go 1.20 or higher
• Docker (optional)

---

Quick Start

git clone https://github.com/idhin/certdrip.git
cd certdrip

go mod tidy
go run main.go

Or run with Docker:

docker-compose up --build

Connect to WebSocket using:

npx wscat -c ws://localhost:8080/ws

Access Web UI via:

http://localhost:8081

---

Contributing

Contributions are welcome.

You can help by:

• Adding support for new CT endpoints
• Building integrations (Redis, Discord, Kafka, etc)
• Optimizing performance and concurrency
• Improving logging, filtering, or output formatting

Just fork the repo, submit a pull request, or open an issue to get involved.

---

⭐️ Support the Project

If you find this project useful or cool, please consider giving it a star on GitHub!
It motivates further development and helps others discover it too.

👉 Give us a ⭐️ on GitHub!

---

Credits

Developed by:

Khulafaur Rasyidin (@idhin)
github.com/idhin

---

License

This project is licensed under the MIT License.
Free to use, modify, and build upon—especially for defenders, researchers, and security engineers.