Who owns MAC prefix ACEF921?

ACEF921 is registered to Dongguan Sunhans Technology Co., Ltd. in the IEEE MA-M registry.

What devices use ACEF921?

Any network device with a MAC address starting AC:EF:92:1 was manufactured by or for Dongguan Sunhans Technology Co., Ltd..

MA-M · OUI prefix

Dongguan Sunhans Technology Co., Ltd.

Any MAC address starting AC:EF:92:1 is registered to Dongguan Sunhans Technology Co., Ltd. in CN.

OUI prefix	ACEF921
Vendor	Dongguan Sunhans Technology Co., Ltd.
Registry	MA-M (28-bit, medium block)
Country	CN
Example MAC	AC:EF:92:1:00:00:00

What this means

The IEEE assigned the MA-M block ACEF921 to Dongguan Sunhans Technology 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 AC:EF:92:1, it is Dongguan Sunhans Technology Co., Ltd. hardware.

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