What this means
The IEEE assigned the MA-M block 1C21D11 to Ognios 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 1C:21:D1:1, it is Ognios GmbH hardware.
Frequently Asked Questions
Who owns MAC prefix 1C21D11?
1C21D11 is registered to Ognios 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. Ognios GmbH's block covers 1,048,576 addresses.
What devices use 1C21D11?
Any network device with a MAC address starting 1C:21:D1:1 was manufactured by or for Ognios GmbH.