1 bit means multicast MAC address of protocol, data stream, or application. 0 indicates unicast having a unique address of destination server. The last three pairs of digits are the number specific to the device, which is known as Network Interface Controller (NIC) specific. It is a 24-bit number that identifies the manufacturer, organization, or any vendor.

First, three octets (group of eight bits) are Organizationally Unique Identifier (OUI).The above MAC Address example figure shows the architecture of MAC.

Mac address is also used in Wi-Fi networks at the airport for a specific device in order to identify it.

MAC address provides a secure way to find senders or receivers in the network and helps prevent unwanted network access. MAC address is a unique number which is used to track a device in a network.