Port scanner Project

Preston P — Thu, 09 Jul 2026 04:26:20 +0000

Building My First Cybersecurity Tool:

A Multi-Threaded Port Scanner in Python

A few weeks ago, I didn't know what a port was. Today, I built a tool that can scan 1,000 ports in under 10 seconds. Here's how I did it.

The Backstory

I'm a high school student interested in cybersecurity, and I wanted to build something real. Not just follow a tutorial, but actually create a tool from scratch.

I decided to build a port scanner because:

It's a fundamental cybersecurity tool
It would teach me networking basics
I could use what I learned in Python class (AP CSP)
I wanted something to put on my GitHub

This is what I built:

** What Is a Port Scanner?**

Think of a computer like a huge apartment building with 1,000 numbered doors (ports). Each door leads to a different service:

Port	Service
80	Websites (HTTP)
443	Secure websites (HTTPS)
22	Remote access (SSH)
3306	Databases (MySQL)

A port scanner "knocks" on each door to see which ones are open. If a door is open, there might be a service running that could be a security risk (or just something useful!).

Conclusion
Building this port scanner taught me more than any textbook could. If you're interested in cybersecurity, I highly recommend building your own tools — it's the best way to understand how things actually work.

Thanks for reading! Feel free to ask questions or suggest improvements.

DEV Community: Preston P

Port scanner Project

Building My First Cybersecurity Tool: