What this means
The IEEE assigned the MA-M block D02212A to GNS-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 D0:22:12:A, it is GNS-GmbH hardware.
Frequently Asked Questions
Who owns MAC prefix D02212A?
D02212A is registered to GNS-GmbH in the IEEE MA-M registry.
What does the MA-M registry type mean?
An MA-M assignment covers 28 bits of the address, giving the vendor 1,048,576 device addresses, a quarter of a full MA-L block. GNS-GmbH's block covers 1,048,576 addresses.
What devices use D02212A?
Any network device with a MAC address starting D0:22:12:A was manufactured by or for GNS-GmbH.