Yes, computers broadcast their MAC address when they first connect to a network so that they can, for example, obtain an IP address via DHCP. However the MAC ad

Yes, computers broadcast their MAC address when they first connect to a network so that they can, for example, obtain an IP address via DHCP. However the MAC address isn't forwarded beyond the LAN to which the computer is connected. https://en.wikipedia.org/wiki/Address_Resolution_Protocol https://en.wikipedia.org/wiki/Address_Resolution_Protocol