What this means
The IEEE assigned the MA-L block E41289 to topsystem 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 E4:12:89, it is topsystem GmbH hardware.
Frequently Asked Questions
Who owns MAC prefix E41289?
E41289 is registered to topsystem 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. topsystem GmbH's block covers 16,777,216 addresses.
What devices use E41289?
Any network device with a MAC address starting E4:12:89 was manufactured by or for topsystem GmbH.