What this means
The IEEE assigned the MA-L block ACB566 to Renesas Electronics (Penang) Sdn. Bhd.. 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:B5:66, it is Renesas Electronics (Penang) Sdn. Bhd. hardware.
Frequently Asked Questions
Who owns MAC prefix ACB566?
ACB566 is registered to Renesas Electronics (Penang) Sdn. Bhd. 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. Renesas Electronics (Penang) Sdn. Bhd.'s block covers 16,777,216 addresses.
What devices use ACB566?
Any network device with a MAC address starting AC:B5:66 was manufactured by or for Renesas Electronics (Penang) Sdn. Bhd..