How can you tell if someone's using your wifi?

How can you tell if someone's using your wifi?
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1 Answer

Answer :

Your router should be able to display the MAC address (each wifi device has a unique MAC address like it’s own telephone number) of all the devices currently connected to it, some can even list all the devices that have ever been connected. If you know the MAC address’s of your devices (they are often written on the back of the device) then you can very easily spot if someone elses devices are connected. Even better, some routers allow you to control access based on MAC addresses so you can limit access to your own devices and your router will completely ignore everything else.
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