What this means
The IEEE assigned the MA-M block 6431394 to Active Brains. Every network interface they manufacture under this block has a MAC address beginning with these digits, followed by a unique per-device identifier. If a device on your network shows a MAC starting 64:31:39:4, it is Active Brains hardware.
Frequently Asked Questions
Who owns MAC prefix 6431394?
6431394 is registered to Active Brains in the IEEE MA-M registry.
What does the MA-M registry type mean?
An MA-M assignment covers 28 bits of the address, giving the vendor 1,048,576 device addresses, a quarter of a full MA-L block. Active Brains's block covers 1,048,576 addresses.
What devices use 6431394?
Any network device with a MAC address starting 64:31:39:4 was manufactured by or for Active Brains.