I have installed Canon 5400 in our network, and found an option to add the printer with its MAC address in the installer, then wondered if that’s possible with a network printer to retrieve its MAC from my PC, although I know what its IP address. Here’s the solutions

1. Click Start -> Run, type cmd and click Ok
2. Type ping xxx.xxx.xxx.xxx, replacing xxx.xxx.xxx.xxx with the IP address of the computer who’s MAC address you want to retrieve( in my case its 192.168.0.3)
3. After the ping response has finished, type arp -a
4. Under Internet Address, locate the IP address you just pinged. In the same line, the corresponding MAC address is listed under Physical Address

You will see something like:
192.168.0.1 00-17-16-00-33-b4 dynamic
192.168.0.2 00-50-04-ee-99-c2 dynamic
192.168.0.3 00-00-b4-ce-2a-ac dynamic