Who owns MAC prefix 00004D?

00004D is registered to DCI CORPORATION in the IEEE MA-L registry.

What devices use 00004D?

Any network device with a MAC address starting 00:00:4D was manufactured by or for DCI CORPORATION.

MA-L · OUI prefix

DCI CORPORATION

Any MAC address starting 00:00:4D is registered to DCI CORPORATION in US.

OUI prefix	00004D
Vendor	DCI CORPORATION
Registry	MA-L (24-bit, large block)
Country	US
Example MAC	00:00:4D:00:00:00

What this means

The IEEE assigned the MA-L block 00004D to DCI 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 00:00:4D, it is DCI CORPORATION hardware.

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