Who owns MAC prefix 00C03D?

00C03D is registered to WIESEMANN & THEIS GMBH in the IEEE MA-L registry.

What devices use 00C03D?

Any network device with a MAC address starting 00:C0:3D was manufactured by or for WIESEMANN & THEIS GMBH.

MA-L · OUI prefix

WIESEMANN & THEIS GMBH

Any MAC address starting 00:C0:3D is registered to WIESEMANN & THEIS GMBH in DE.

OUI prefix	00C03D
Vendor	WIESEMANN & THEIS GMBH
Registry	MA-L (24-bit, large block)
Country	DE
Example MAC	00:C0:3D:00:00:00

What this means

The IEEE assigned the MA-L block 00C03D to WIESEMANN & THEIS GMBH. 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 00:C0:3D, it is WIESEMANN & THEIS GMBH hardware.

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