Who owns MAC prefix 28B221?

28B221 is registered to Sienda Multimedia Ltd in the IEEE MA-L registry.

What devices use 28B221?

Any network device with a MAC address starting 28:B2:21 was manufactured by or for Sienda Multimedia Ltd.

MA-L · OUI prefix

Sienda Multimedia Ltd

Any MAC address starting 28:B2:21 is registered to Sienda Multimedia Ltd.

OUI prefix	28B221
Vendor	Sienda Multimedia Ltd
Registry	MA-L (24-bit, large block)
Example MAC	28:B2:21:00:00:00

What this means

The IEEE assigned the MA-L block 28B221 to Sienda Multimedia Ltd. 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 28:B2:21, it is Sienda Multimedia Ltd hardware.

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