Who owns MAC prefix DCB4C4?

DCB4C4 is registered to Microsoft XCG in the IEEE MA-L registry.

What devices use DCB4C4?

Any network device with a MAC address starting DC:B4:C4 was manufactured by or for Microsoft XCG.

MA-L · OUI prefix

Microsoft XCG

Any MAC address starting DC:B4:C4 is registered to Microsoft XCG in US.

OUI prefix	DCB4C4
Vendor	Microsoft XCG
Registry	MA-L (24-bit, large block)
Country	US
Example MAC	DC:B4:C4:00:00:00

What this means

The IEEE assigned the MA-L block DCB4C4 to Microsoft XCG. 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 DC:B4:C4, it is Microsoft XCG hardware.

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