What this means
The IEEE assigned the MA-M block B437D1B to NSI Co., 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 B4:37:D1:B, it is NSI Co., Ltd. hardware.
Frequently Asked Questions
Who owns MAC prefix B437D1B?
B437D1B is registered to NSI Co., 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. NSI Co., Ltd.'s block covers 1,048,576 addresses.
What devices use B437D1B?
Any network device with a MAC address starting B4:37:D1:B was manufactured by or for NSI Co., Ltd..