How to find the MAC address of a printer network-interface?

In Windows 10 there's a very simple command, to find the physical address of an assigned IP-address.

For this, you simply need to open a console window by typing CMD.
Once in the console, type the following command:

C:\>arp 172.16.1.11 -a

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Knowing that 172.16.1.11 is the IP address from the printer, you will get the following output:

Interface:            172.16.3.145          --- 0xd
Internet Address      Physical Address      Type
172.16.1.11           00-50-56-a4-68-d0     dynamic

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So in this case, you have now found the physical address: 00-50-56-a4-68-d0

This is the MAC address of your printer's network-interface...

An alternate way is -assuming the printer is connected to a router- you can access the router's administrative control panel- you can verify all connected devices. Each active device, as well recently connected devices, should list the IP address as well as the MAC address.