Who owns MAC prefix 3CDC03D?

3CDC03D is registered to Vieletech in the IEEE MA-M registry.

What devices use 3CDC03D?

Any network device with a MAC address starting 3C:DC:03:D was manufactured by or for Vieletech.

MA-M · OUI prefix

Vieletech

Any MAC address starting 3C:DC:03:D is registered to Vieletech in US.

OUI prefix	3CDC03D
Vendor	Vieletech
Registry	MA-M (28-bit, medium block)
Country	US
Example MAC	3C:DC:03:D:00:00:00

What this means

The IEEE assigned the MA-M block 3CDC03D to Vieletech. 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:DC:03:D, it is Vieletech hardware.

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