When you run a port scan from sites like Cualesmiip.com, you’ll see a list of ports that are open, closed, or filtered. But what do these statuses mean? And how do they affect your security?
What is a port?
A port is like a logical “door” that allows a service or application on your device to communicate with the outside world. Each protocol or service uses a specific port. For example:
- Port 80: web browsing (HTTP)
- Port 443: secure browsing (HTTPS)
- Port 21: file transfer (FTP)
Understanding the results
✅ Open port
This means the port is accessible from outside and there is likely an active service listening. For example, if you’re running a web server, it’s normal for ports 80 or 443 to be open.
⚠ Caution: if you don’t recognize the service, an open port can be a security risk.
🚫 Closed port
The port is not in use, and there’s no service listening on it. While it’s visible from outside, it doesn’t pose an immediate threat.
🛡️ Filtered port
A filtered port means a firewall or router is blocking access. It’s not possible to tell if it’s open or closed, which is often good for security.
What should you do with this information?
- 🔍 Review open ports: make sure only essential ones are enabled.
- 🧱 Set up a firewall: block unnecessary ports to prevent unwanted access.
- 🔐 Keep services updated: if you expose services, ensure they’re updated to avoid vulnerabilities.
Why run a port scan?
Running a port scan helps you spot weaknesses in your network. Alongside tools like checking your public IP address or knowing your approximate geolocation, you get a clearer view of how your network appears to the world.
In this article we’ve learned that…
Understanding port scan results is key to protecting your privacy and digital security. Knowing which services are exposed lets you take control: close unnecessary ports and set up your firewall properly.
📌 If you haven’t already, run your port scan and check your public IP right now. It’s free and requires no installation!
