Who owns MAC prefix 300D43?

300D43 is registered to Microsoft Mobile Oy in the IEEE MA-L registry.

What devices use 300D43?

Any network device with a MAC address starting 30:0D:43 was manufactured by or for Microsoft Mobile Oy.

MA-L · OUI prefix

Microsoft Mobile Oy

Any MAC address starting 30:0D:43 is registered to Microsoft Mobile Oy in FI.

OUI prefix	300D43
Vendor	Microsoft Mobile Oy
Registry	MA-L (24-bit, large block)
Country	FI
Example MAC	30:0D:43:00:00:00

What this means

The IEEE assigned the MA-L block 300D43 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 30:0D:43, it is Microsoft Mobile Oy hardware.

Other Microsoft Mobile Oy prefixes

Microsoft Mobile Oy holds 11 registered blocks in total.

38256B 38F23E 5CCA1A 607EDD 6C2483 6C2779 6C8FB5 A4516F B4E1C4 E498D1

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