You have two built-in ways to find this information ...

Find MAC address without Wi-Fi: Connect to a mobile hotspot > Connect to Wi-Fi > Show MAC address. This article explains how to find the MAC address for a device in the Google Home app. You can locate ...

When scanning a network, you can see IP addresses and MAC addresses of devices on that network. A primary rule is to never duplicate IP addresses to avoid creating conflicts. The same is true for MAC ...