What this means
The IEEE assigned the MA-M block 28B77CA to Simaudio Ltd. 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 28:B7:7C:A, it is Simaudio Ltd hardware.
Frequently Asked Questions
Who owns MAC prefix 28B77CA?
28B77CA is registered to Simaudio Ltd 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. Simaudio Ltd's block covers 1,048,576 addresses.
What devices use 28B77CA?
Any network device with a MAC address starting 28:B7:7C:A was manufactured by or for Simaudio Ltd.