What this means
The IEEE assigned the MA-M block B4ABF31 to NTR-RRL LLC. 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:AB:F3:1, it is NTR-RRL LLC hardware.
Frequently Asked Questions
Who owns MAC prefix B4ABF31?
B4ABF31 is registered to NTR-RRL LLC 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. NTR-RRL LLC's block covers 1,048,576 addresses.
What devices use B4ABF31?
Any network device with a MAC address starting B4:AB:F3:1 was manufactured by or for NTR-RRL LLC.