What this means
The IEEE assigned the MA-L block 04AC44 to Holtek Semiconductor 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 04:AC:44, it is Holtek Semiconductor Inc. hardware.
Frequently Asked Questions
Who owns MAC prefix 04AC44?
04AC44 is registered to Holtek Semiconductor 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. Holtek Semiconductor Inc.'s block covers 16,777,216 addresses.
What devices use 04AC44?
Any network device with a MAC address starting 04:AC:44 was manufactured by or for Holtek Semiconductor Inc..