Who owns MAC prefix 281D21?

281D21 is registered to IN ONE SMART TECHNOLOGY(H,K,)LIMITED in the IEEE MA-L registry.

What devices use 281D21?

Any network device with a MAC address starting 28:1D:21 was manufactured by or for IN ONE SMART TECHNOLOGY(H,K,)LIMITED.

MA-L · OUI prefix

IN ONE SMART TECHNOLOGY(H,K,)LIMITED

Any MAC address starting 28:1D:21 is registered to IN ONE SMART TECHNOLOGY(H,K,)LIMITED in HK.

OUI prefix	281D21
Vendor	IN ONE SMART TECHNOLOGY(H,K,)LIMITED
Registry	MA-L (24-bit, large block)
Country	HK
Example MAC	28:1D:21:00:00:00

What this means

The IEEE assigned the MA-L block 281D21 to IN ONE SMART TECHNOLOGY(H,K,)LIMITED. 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 28:1D:21, it is IN ONE SMART TECHNOLOGY(H,K,)LIMITED hardware.

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