What happens to the MAC address when you move a computer to another network?

The MAC address is a unique identifier for a networking card. Each networking card has a MAC address assigned to it during it's manufacturing, and thus it does not change when a computer moves between networks (unlike an IP address which is assigned by the network).

A few things to note:

- A computer only has a MAC address if it has a physical or virtual network card

- A computer has as many MAC addresses as it has networking cards

- MAC addresses CAN be modified before being broadcast to the rest of the network, however generally this results in the computer not receiving intended traffic and requires specialized software