Someone with your Wi-Fi passphrase could change their device’s MAC address to match an approved one and take its place on your Wi-Fi network. Even if you can use it, it’s not entirely secure. Some routers let you set a whitelist of only approved devices and prevent other devices from connecting in the future. Some routers let you blacklist (ban) devices with a certain MAC address from connecting. Each wireless device has a unique MAC address. Some routers have access control features that can manage which devices are allowed to connect. Option 2: Use MAC Address Filtering on Your Router RELATED: How to Change Your Wi-Fi Network's Name and Password If you’re hosting an open Wi-Fi network, anyone will be able to connect. This all assumes you’ve set a password on your router! Ensure you enable secure encryption (WPA2) and set a strong passphrase. Look for a “Wireless” or “Wi-Fi” section in your router’s options. We’ve got a guide to accessing your router’s web interface, and you can also perform a web search for your router’s name and model number to find the manufacturer’s manual and official instructions. You can change the Wi-Fi network’s name while you’re at it, too. To do this, you’ll need to access your router’s configuration settings-usually in a web interface-sign in, and change the Wi-Fi password. (And, even if they don’t remember the password, there are ways to recover saved Wi-Fi passwords on Windows PCs and other devices.) Even if you’re capable of blacklisting a device on your router so it can’t reconnect, someone with your Wi-Fi password could connect on a new device.

But it’s also the only real, foolproof method. Let’s be honest: If you have a lot of devices, reconnecting them all will be a pain. Anyone who doesn’t have your new password won’t be able to connect. You’ll have to reconnect to the Wi-Fi network by entering the new password on all your devices. This will forcibly disconnect all devices from your Wi-Fi network-even your own. The easiest, most secure method is merely changing your Wi-Fi network’s password on your router.

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