Port Scanner: Check Digital Doors

Is your server locked tight or wide open? Use our tool to find open ports on any IP or domain and see what services are running.

Quick Tool Fact

A Port Scanner probes a computer to see which "ports" are listening for connections. It’s like checking if the doors of a house are locked. Finding open ports helps you fix security gaps in your network.

What is a Port Scanner?

Think of an IP address as a house. Inside that house, there are thousands of doors—these are called Ports. Each door is used for a different task, like surfing the web or sending emails. AirOI Checker lets you see which of these doors are "Open" and which are "Locked."

For Server Owners

Check if your website is safe. If you see a port open that shouldn't be, you might need to fix your firewall settings.

Network Testing

If your game server or smart camera isn't connecting, use this tool to see if the port is actually working.

Common ports you should know

There are 65,535 ports in total! But only a few are used every day:

  • 80

    HTTP: Used for normal, unencrypted website traffic.

  • 443

    HTTPS: Used for secure, encrypted website browsing.

  • 22

    SSH: A door for developers to log in and manage servers.

Safety Warning

Keeping ports like 21 (FTP) or 3306 (Database) open to everyone is like leaving your back door unlocked. Only open them if you really need to!

Frequently Asked Questions

Is it legal to scan ports?

Scanning your own server or devices is totally fine. But scanning someone else's server without asking might be seen as suspicious activity.

What does "Closed" mean?

It means the door is shut. No service is listening on that port, which is generally safer for security.

Why scan for web ports?

If your website won't load, checking ports 80 and 443 can tell you if the web server is actually running.