Once you have given someone your Wi-Fi password, they will have unlimited access to your Wi-Fi and they will be able to connect to your network on all of their devices. Anyway, that’s how it works. Here’s how to download them.
Option 1: Change Wi-Fi Password
The easiest and safest way is to simply change the password of your Wi-Fi network on your router. This will forcefully disconnect all devices from your Wi-Fi network — even your own. You will need to reconnect to the Wi-Fi network by entering the new password on all of your devices. Anyone who does not have your new password will not be able to connect.
Let’s be honest: if you have a lot of devices, reconnecting them all will be a hassle. But it’s also the only real, reliable method. Even though you can blacklist a device on your router so it can’t reconnect, someone with your Wi-Fi password can connect to the new device. (And even if they don’t remember the password, there are ways to recover saved Wi-Fi passwords on Windows PCs and other devices.)
To do this, you need to access your router’s configuration settings — usually through a web interface — log in and change your Wi-Fi password. You can also change the name of a Wi-Fi network while you’re on it. We have a guide for accessing your router’s web interface, and you can also search the web for your router’s name and model number to find the manufacturer’s manual and official instructions. Look for the «Wireless» or «Wi-Fi» section in your router’s settings.
All of this assumes that you have set a password on your router! Make sure you enable secure encryption (WPA2) and set a strong passphrase. If you’re using an open Wi-Fi network, anyone can connect.
RELATED: How to change the name and password of your Wi-Fi network
Option 2: Use MAC address filtering on your router
Some routers have access control features that can determine which devices are allowed to connect. Every wireless device has a unique MAC address. Some routers allow you to blacklist devices with a specific MAC address. Some routers allow you to whitelist only approved devices and prevent other devices from connecting in the future.
Not all routers have this option. Even if you can use it, it’s not entirely safe. Someone with your Wi-Fi passphrase can change their device’s MAC address to an approved one and take their place on the Wi-Fi network. Even if no one does, you will have to manually enter MAC addresses when connecting new devices, otherwise an attacker can connect at any time — this does not seem ideal.
For all these reasons, we do not recommend using MAC address filtering.
But if you just want to temporarily turn off a device—maybe your kids’ device—and you’re not worried about them bypassing the block, this can be a good method.