What this means
The IEEE assigned the MA-M block 383A21D to Colooc AB. 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 38:3A:21:D, it is Colooc AB hardware.
Frequently Asked Questions
Who owns MAC prefix 383A21D?
383A21D is registered to Colooc AB 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. Colooc AB's block covers 1,048,576 addresses.
What devices use 383A21D?
Any network device with a MAC address starting 38:3A:21:D was manufactured by or for Colooc AB.