What this means
The IEEE assigned the MA-M block 189BA5B to Eutron SPA. 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 18:9B:A5:B, it is Eutron SPA hardware.
Frequently Asked Questions
Who owns MAC prefix 189BA5B?
189BA5B is registered to Eutron SPA 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. Eutron SPA's block covers 1,048,576 addresses.
What devices use 189BA5B?
Any network device with a MAC address starting 18:9B:A5:B was manufactured by or for Eutron SPA.