Random MAC Address Generator

A MAC address is a 48-bit hardware identifier for a network interface, written as six hexadecimal bytes such as 02:1A:2B:3C:4D:5E. It labels a device on a local network segment so frames reach the right adapter.

It sets the U/L bit in the first byte to mark the address as one you assigned yourself rather than one burned in by a manufacturer. The generator also clears the multicast bit at the same time, so the result is a valid unicast address that will not collide with a real vendor's range.

Three styles: colon separated (AA:BB:CC:DD:EE:FF), hyphen separated (AA-BB-CC-DD-EE-FF) and Cisco three-group dot notation (aabb.ccdd.eeff). Each can be shown in uppercase or lowercase hex.

When Locally administered is on, the tool forces the U/L bit and clears the multicast bit on the first byte, which limits its low nibble to 2, 6, A or E. Turn the option off if you want a fully random first byte instead.

No. The bytes are random, so a collision is possible though extremely unlikely across a small network. These addresses suit testing, virtual machines and labs, not scenarios that demand guaranteed global uniqueness.

Between 1 and 50 per press. The How many field clamps values into that range, and each address in the batch is generated independently so they will differ from one another.

Yes, for MAC spoofing or assigning a VM you can paste a locally administered address into your OS or hypervisor. Keep it locally administered to stay clear of registered vendor prefixes, and avoid duplicating an address already live on the same segment.

Cisco IOS and many switches display MAC addresses as three dot-separated groups of four hex digits, like aabb.ccdd.eeff. The dot option matches that notation so you can paste addresses straight into switch or router configs.

No. Generation uses your browser's random number source and runs entirely on your device, so it is private and keeps working offline once the page has loaded.