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.
Frequently Asked Questions
Who owns MAC prefix DCB4C4?
DCB4C4 is registered to Microsoft XCG in the IEEE MA-L registry.
What does the MA-L registry type mean?
An MA-L assignment, the IEEE's original OUI format, gives the vendor the first three octets and 16,777,216 device addresses under them. Microsoft XCG's block covers 16,777,216 addresses.
What devices use DCB4C4?
Any network device with a MAC address starting DC:B4:C4 was manufactured by or for Microsoft XCG.