Who owns MAC prefix 3C3B4D?

3C3B4D is registered to Toyo Seisakusho Kaisha, Limited in the IEEE MA-L registry.

What devices use 3C3B4D?

Any network device with a MAC address starting 3C:3B:4D was manufactured by or for Toyo Seisakusho Kaisha, Limited.

MA-L · OUI prefix

Toyo Seisakusho Kaisha, Limited

Any MAC address starting 3C:3B:4D is registered to Toyo Seisakusho Kaisha, Limited in JP.

OUI prefix	3C3B4D
Vendor	Toyo Seisakusho Kaisha, Limited
Registry	MA-L (24-bit, large block)
Country	JP
Example MAC	3C:3B:4D:00:00:00

What this means

The IEEE assigned the MA-L block 3C3B4D to Toyo Seisakusho Kaisha, Limited. 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 3C:3B:4D, it is Toyo Seisakusho Kaisha, Limited hardware.

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