Who owns MAC prefix DC21B9?

DC21B9 is registered to Sentec Co.Ltd in the IEEE MA-L registry.

What devices use DC21B9?

Any network device with a MAC address starting DC:21:B9 was manufactured by or for Sentec Co.Ltd.

MA-L · OUI prefix

Sentec Co.Ltd

Any MAC address starting DC:21:B9 is registered to Sentec Co.Ltd in KR.

OUI prefix	DC21B9
Vendor	Sentec Co.Ltd
Registry	MA-L (24-bit, large block)
Country	KR
Example MAC	DC:21:B9:00:00:00

What this means

The IEEE assigned the MA-L block DC21B9 to Sentec Co.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 DC:21:B9, it is Sentec Co.Ltd hardware.

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