![]() A company named Renew London used trash bins in the city of London to track people’s movements around the city based on their MAC addresses. When you walk around, your smartphone scans for nearby Wi-Fi networks and broadcasts its MAC address. Device Tracking: Because they’re unique, MAC addresses can be used to track you.(Free, limited Wi-Fi may also be tracked using browser cookies or an account system.) ![]() Change your MAC address and you could get more Wi-Fi. For example, an airport Wi-Fi network might offer a free 30 minutes and then ban your MAC address from receiving more Wi-Fi. Device Identification: Many airport Wi-Fi networks and other public Wi-Fi networks use a device’s MAC address to identify it.You may need to change your router or computer’s MAC address to connect. MAC Authentication: Some Internet service providers may require authentication with a MAC address and only allow a device with that MAC address to connect to the Internet. ![]() This isn’t a great security tool because people can spoof their MAC addresses.
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