Who owns MAC prefix 40DC9D?

40DC9D is registered to HAJEN in the IEEE MA-L registry.

What devices use 40DC9D?

Any network device with a MAC address starting 40:DC:9D was manufactured by or for HAJEN.

MA-L · OUI prefix

HAJEN

Any MAC address starting 40:DC:9D is registered to HAJEN in KR.

OUI prefix	40DC9D
Vendor	HAJEN
Registry	MA-L (24-bit, large block)
Country	KR
Example MAC	40:DC:9D:00:00:00

What this means

The IEEE assigned the MA-L block 40DC9D to HAJEN. 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:DC:9D, it is HAJEN hardware.

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