Canon EOS-1D X Mark III Advanced User's Manual page 626

Steps on the computer
2.
Start EOS Utility on the computer.
3.
In EOS Utility, click [Pairing over Wi-Fi/LAN].
4.
Click [Connect] on the computer.
If a firewall-related message is displayed, select [Yes].
Select the camera to connect to, then click [Connect].
If multiple cameras are listed, identify the camera to connect to by MAC
address, as shown on the camera screen.
The camera MAC address can be checked on the [MAC address]
screen ( ).
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