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As mentioned in the other posts, if you have a MAG box, it to has a MAC address, and the reason you give that, is that what a provider uses to tie your service to you (your device). For example, your Smart TV has a network card in it, so if it can use both LAN and Wi-Fi, you'll have 2 MAC addresses - 1 for LAN, 1 for Wi-Fi, and these will never change. MAC addresses are hard-coded into a network card and can't be changed. You didn't actually say what device you have/use to connect with, so just to give a bare bones answer to the 'changed once it’s been on a hop' question JIC that's what you were asking (so the 'Network MAC' one u/danny121pt mentioned).
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