What this means
The IEEE assigned the MA-L block ACA919 to TrekStor GmbH. 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:A9:19, it is TrekStor GmbH hardware.
Frequently Asked Questions
Who owns MAC prefix ACA919?
ACA919 is registered to TrekStor GmbH 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. TrekStor GmbH's block covers 16,777,216 addresses.
What devices use ACA919?
Any network device with a MAC address starting AC:A9:19 was manufactured by or for TrekStor GmbH.