> This makes more sense than above, but MAC addresses can be spoofed or even just used as a proxy, so you would need to be careful that the information you're u

> This makes more sense than above, but MAC addresses can be spoofed or even just used as a proxy, so you would need to be careful that the information you're uniquely storing against the MAC address is intended to be unique. Most use cases that immediately springs to my mind wouldn't follow his unique rule but I'm sure there will some examples that do. As one example, there was a bug in one version of CyanogenMOD that caused many phones to broadcast the same MAC, even when connected to Wifi. In some cases, this would cause different devices to kick each other off of a connection. See e.g. https://forum.xda-developers.com/tmobile-lg-g3/help/2x-lg-g3-cm12-mac-address-wifi-issue-t3039699 https://forum.xda-developers.com/tmobile-lg-g3/help/2x-lg-g3...