A Media Access Control (MAC) address is a set of numbers and letters that serve as the unique identifier of a device’s network interface controller (NIC).

It serves as the ID card of your device in a network, allowing it to communicate with other devices. A MAC address consists of six pairs of characters separated by full colons. E.g., 0A:1B:2C:3A:44:5C.

Unlike IP addresses, MAC addresses are static because they are only used in the local network.

MAC Address Tracking

When you enable a Wi-Fi connection on your device, it advertises its unencrypted MAC address to Wi-Fi hotspots in range and attempts to connect. Malicious people can use even simple trackers to monitor your presence without you noticing it.

MAC Addresses Security and Privacy Issues