Knock Knock Guess Who

“Knock Knock. Who’s There? Me. With a Go-Based Port Scanner.”

Once upon a time, in the vast wild west of the internet, where open ports roamed free and firewalls had trust issues, there lived a humble developer (me) who decided to build… yet another port scanner. But not just any scanner — oh no. This one was forged in the fires of Golang, the programming language that basically said, “What if Python had a real job?”

Now, before you roll your eyes and mutter “Great, another scanner…” — hear me out.

What is a port scanner?
Imagine being invited to a party with 65,535 doors. You knock on each one, and some say “Hey! SSH here!”, others whisper “HTTP lives here but don’t tell anyone,” and a few just… silently scream in closed silence. That’s a port scanner. It knocks, listens, and reports who’s home.

Why is it important?
Because in networking, ignorance isn’t bliss — it’s a breach waiting to happen. Whether you’re an ethical hacker, sysadmin, or just someone who likes knowing way too much about what their fridge is doing on the network, port scanning is your flashlight in the dark.

So… why Go?
Speed. Concurrency. Simplicity. Go lets me spin up thousands of goroutines (tiny workers) without breaking a sweat. Meanwhile, Python is somewhere in the corner asking for more RAM and Node.js is still waiting on a promise.

Why build your own?
Because using Nmap is great — until you want something lean, mean, and fully customizable. Writing your own scanner in Go is like building your own espresso machine: completely unnecessary, totally overkill, and 100% satisfying.

Final thoughts
If you’re into cybersecurity, dev tools, or just appreciate code that slaps — building a port scanner in Go is a great way to learn sockets, networking, and how many open ports your printer shouldn’t have.

And if you’re not scanning your own network… someone else probably is.

Stay paranoid.
– The guy knocking on all the doors (politely, of course)