Who owns MAC prefix 78D8004?

78D8004 is registered to CS Instruments GmbH in the IEEE MA-M registry.

What devices use 78D8004?

Any network device with a MAC address starting 78:D8:00:4 was manufactured by or for CS Instruments GmbH.

MA-M · OUI prefix

CS Instruments GmbH

Any MAC address starting 78:D8:00:4 is registered to CS Instruments GmbH in DE.

OUI prefix	78D8004
Vendor	CS Instruments GmbH
Registry	MA-M (28-bit, medium block)
Country	DE
Example MAC	78:D8:00:4:00:00:00

What this means

The IEEE assigned the MA-M block 78D8004 to CS Instruments 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 78:D8:00:4, it is CS Instruments GmbH hardware.

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