What this means
The IEEE assigned the MA-L block AC81B5 to Accton Technology 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 AC:81:B5, it is Accton Technology Corporation hardware.
Frequently Asked Questions
Who owns MAC prefix AC81B5?
AC81B5 is registered to Accton Technology Corporation 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. Accton Technology Corporation's block covers 16,777,216 addresses.
What devices use AC81B5?
Any network device with a MAC address starting AC:81:B5 was manufactured by or for Accton Technology Corporation.