Who owns MAC prefix B4E1C4?

B4E1C4 is registered to Microsoft Mobile Oy in the IEEE MA-L registry.

What devices use B4E1C4?

Any network device with a MAC address starting B4:E1:C4 was manufactured by or for Microsoft Mobile Oy.

MA-L · OUI prefix

Microsoft Mobile Oy

Any MAC address starting B4:E1:C4 is registered to Microsoft Mobile Oy in FI.

OUI prefix	B4E1C4
Vendor	Microsoft Mobile Oy
Registry	MA-L (24-bit, large block)
Country	FI
Example MAC	B4:E1:C4:00:00:00

What this means

The IEEE assigned the MA-L block B4E1C4 to Microsoft Mobile Oy. 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 B4:E1:C4, it is Microsoft Mobile Oy hardware.

Other Microsoft Mobile Oy prefixes

Microsoft Mobile Oy holds 11 registered blocks in total.

300D43 38256B 38F23E 5CCA1A 607EDD 6C2483 6C2779 6C8FB5 A4516F E498D1

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