CS Instruments GmbH - MAC Prefix 78D8004 (MA-M)

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.

Frequently Asked Questions

Who owns MAC prefix 78D8004?

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

What does the MA-M registry type mean?

An MA-M assignment covers 28 bits of the address, giving the vendor 1,048,576 device addresses, a quarter of a full MA-L block. CS Instruments GmbH's block covers 1,048,576 addresses.

What devices use 78D8004?

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

OUI prefix	78D8004
Vendor	CS Instruments GmbH
Registry	MA-M (28-bit, medium block)
Block size	1,048,576 addresses
Country	DE
Other blocks by this vendor	1 total
Example MAC	78:D8:00:4:00:00:00