What this means
The IEEE assigned the MA-M block D47C44B to OPTiM Corporation. 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 D4:7C:44:B, it is OPTiM Corporation hardware.
Frequently Asked Questions
Who owns MAC prefix D47C44B?
D47C44B is registered to OPTiM Corporation 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. OPTiM Corporation's block covers 1,048,576 addresses.
What devices use D47C44B?
Any network device with a MAC address starting D4:7C:44:B was manufactured by or for OPTiM Corporation.