How can I find a MAC address of LAN device from old computer hard drive

My old computers motherboard died. And I bought a new computer and kept the old HDD. But my internet connection is bound to the old computer LAN MAC address. I have tried to find it in the old drive windows register, but there is not defined as Is in windows an option like in Linux, that you can search the logsin the HDD and find the Mac addresses used in the past? Thanks in advance for any advice.