The Schneider-Electric Modicon M221 logic controllers can be reached by USB interface or by Ethernet interface if the IP address is known. It can be useful to know the IP factory fault address if you do not have an USB cable. By default, the IP address is : 10.10.X.Y with X and Y = penultimate and last digits of the MAC address converted from hexadecimal to decimal.
Exemple for the MAC address 10:BC:0C:07:14:2A, the IP address is 10.10.20.42