Who owns MAC prefix 40DDD1?

40DDD1 is registered to Beautiful Card Corporation in the IEEE MA-L registry.

What devices use 40DDD1?

Any network device with a MAC address starting 40:DD:D1 was manufactured by or for Beautiful Card Corporation.

MA-L · OUI prefix

Beautiful Card Corporation

Any MAC address starting 40:DD:D1 is registered to Beautiful Card Corporation in TW.

OUI prefix	40DDD1
Vendor	Beautiful Card Corporation
Registry	MA-L (24-bit, large block)
Country	TW
Example MAC	40:DD:D1:00:00:00

What this means

The IEEE assigned the MA-L block 40DDD1 to Beautiful Card Corporation. 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 40:DD:D1, it is Beautiful Card Corporation hardware.

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