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I built this Port Scanner project as a beginner to understand how real network tools work behind the scenes. I wanted to go beyond theory and create something practical with Python that helped me learn sockets, protocols, threading, and secure coding habits.
The project started with a simple TCP scan on localhost. After confirming it could detect open ports, I improved it step by step: input validation, scan timing, JSON export, optional banner grabbing, and finally UDP scan support. I then refactored it into modules (`cli.py`, `scanner.py`, `utils.py`) to make it cleaner and easier to maintain. To finish it like a real software project, I added automated tests with `unittest` and full documentation.
What I learned most was that cybersecurity tools are not just about “hacking” outputs, they are about careful engineering, responsible use, and reliable results. This project taught me how to design, test, and document a tool from scratch while following ethical boundaries.
This is only the beginning. Next, I plan to add smarter service detection, improved UDP accuracy, and a small web interface for visualization.
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