What this means
The IEEE assigned the MA-L block 9CDF03 to Harman/Becker Automotive Systems 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 9C:DF:03, it is Harman/Becker Automotive Systems GmbH hardware.
Frequently Asked Questions
Who owns MAC prefix 9CDF03?
9CDF03 is registered to Harman/Becker Automotive Systems GmbH in the IEEE MA-L registry.
What does the MA-L registry type mean?
An MA-L assignment, the IEEE's original OUI format, gives the vendor the first three octets and 16,777,216 device addresses under them. Harman/Becker Automotive Systems GmbH's block covers 16,777,216 addresses.
What devices use 9CDF03?
Any network device with a MAC address starting 9C:DF:03 was manufactured by or for Harman/Becker Automotive Systems GmbH.