Who owns MAC prefix 681DEF?

681DEF is registered to Shenzhen CYX Technology Co., Ltd. in the IEEE MA-L registry.

What devices use 681DEF?

Any network device with a MAC address starting 68:1D:EF was manufactured by or for Shenzhen CYX Technology Co., Ltd..

MA-L · OUI prefix

Shenzhen CYX Technology Co., Ltd.

Any MAC address starting 68:1D:EF is registered to Shenzhen CYX Technology Co., Ltd. in CN.

OUI prefix	681DEF
Vendor	Shenzhen CYX Technology Co., Ltd.
Registry	MA-L (24-bit, large block)
Country	CN
Example MAC	68:1D:EF:00:00:00

What this means

The IEEE assigned the MA-L block 681DEF to Shenzhen CYX 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 68:1D:EF, it is Shenzhen CYX Technology Co., Ltd. hardware.

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