This post is how to find out what the MAC address of a remote system is. This does require you to be able to talk to the machine. If the computer has a firewall turned on you might not be able to get the info.
This post has nothing to do with Apple Mac computers. The Mac Address of a computer is a physical address that is burned into the card at the time of purchase. The MAC address is a layer 2 address and all IP addresses get converted to the MAC address using ARP.
Windows by default (Linux as well) comes with a program called “ARP”. If you run:
from a command line you will see the MAC address of the computers you are able to talk to on your LOCAL network. If you want to check what the MAC address is you only have to ping the computer. Write down it’s IP address and then run the above ARP command. The ARP command will output the IP address of the computers it has talked to and show you what that computer’s MAC address is.
There are some pretty big programs out there that you have to “pay for” in order to get this functionality. Really those programs are really just doing these two command and reporting back to you.