The easiest way to find the MAC address on a Raspberry Pi is to use the “ifconfig” command. You’ll find the MAC address after the keyword “ether” in the section corresponding to your network interface. It’s represented as a 12-digit hexadecimal number (AA:BB:CC:DD:EE:FF).
Open the terminal (shortcut in the top bar)  Type the ifconfig command and press enter
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The result looks like the following:
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You can see one paragraph per network card on your system
eth0 corresponds to the wired card, and wlan0 is the Wi-Fi card
In each paragraph, you can see the IPv4 and IPv6 configuration, the MAC address and a few statistics about the network card
The MAC address is visible after the “ether” keyword, here:
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So, in this case, the MAC address is b8:27:eb:4f:15:95