How to discover all devices connected to your WLAN

Have you ever suspected that your neighbor is stealing your WiFi? Are you still using the default password that comes with the router and have you noticed for a while that your internet connection isn’t working as well as it used to?

If the answer is yes, but you only have a suspicion, the best thing you can do is get to work to confirm it. To do this, you can use a free program called Windows Wireless Network Guardian, a small tool for your PC responsible for identifying all devices connected to your wireless network.

How to use Wireless Network Watcher to detect WiFi intruders and thieves

To detect the intruder we’ll use a very simple trick with this handy tool.

  • Download the program from the official website of Wireless Network Guardian.
  • Unzip the ZIP file and run the program. Don’t worry, since it’s a portable application, you don’t need to install it on your computer.
  • Wireless Network Watcher will automatically run an initial scan and show a list of all the devices connected to our local network, including the router and the rest of the network components we may have installed.

In this list, for each of the connected devices, we will see its local IP address, MAC address, its name (if defined) along with other data and information. The question is clear: how can we know which of these devices is the intruder?

To find out what we’re going to do is Turn off all devices connected to the Wi-Fi network, One after the other. At the end when they are all off, run Wireless Network Watcher again. If everything went well, you should only see 2 connected devices: your router and the PC you are running the query from.

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If there are more devices, it means you’ve just discovered your particular WiFi thief.

I’ve already spotted the WiFi thief, now what?

Now that you know the intruder’s IP and MAC address, you can block access Adding to the router’s blacklist. An other possibility would be Create a white list where only your own devices are allowed. Or if you prefer, you can also try simply changing the password to a more secure one.

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