What this means
The IEEE assigned the MA-M block BC9740D to Rollock Oy. 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 BC:97:40:D, it is Rollock Oy hardware.
Frequently Asked Questions
Who owns MAC prefix BC9740D?
BC9740D is registered to Rollock Oy 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. Rollock Oy's block covers 1,048,576 addresses.
What devices use BC9740D?
Any network device with a MAC address starting BC:97:40:D was manufactured by or for Rollock Oy.