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Random MAC Address Generator
Generate valid random MAC addresses (unicast, locally administered) in several formats, right in your browser.
What a MAC address is
The MAC is the physical identifier of the network card, with 48 bits (6 bytes), like 3C:5A:B4:1F:22:0E. The first 3 bytes identify the manufacturer (OUI); the last 3, the device. It is used within the local network, for example in the router's MAC filtering and in DHCP IP reservation.
Random MAC and privacy
Generating a random MAC is useful for network testing and for privacy: modern phones already use a random MAC per Wi-Fi network precisely to make tracking harder. A locally administered address (2nd bit of the first byte set to 1) signals that it did not come from a manufacturer, the correct thing for an invented MAC.
We also force the address to be unicast (1st bit at 0), as a valid station MAC requires. Generated with the browser's cryptographic generator; nothing is sent.