What this means
The IEEE assigned the MA-L block AC40B5 to Lumiva Inc.. 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 AC:40:B5, it is Lumiva Inc. hardware.
Frequently Asked Questions
Who owns MAC prefix AC40B5?
AC40B5 is registered to Lumiva Inc. in the IEEE MA-L registry.
What does the MA-L registry type mean?
An MA-L assignment, the IEEE's original OUI format, gives the vendor the first three octets and 16,777,216 device addresses under them. Lumiva Inc.'s block covers 16,777,216 addresses.
What devices use AC40B5?
Any network device with a MAC address starting AC:40:B5 was manufactured by or for Lumiva Inc..