What this means
The IEEE assigned the MA-L block 0009C1 to PROCES-DATA A/S. 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 00:09:C1, it is PROCES-DATA A/S hardware.
Frequently Asked Questions
Who owns MAC prefix 0009C1?
0009C1 is registered to PROCES-DATA A/S 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. PROCES-DATA A/S's block covers 16,777,216 addresses.
What devices use 0009C1?
Any network device with a MAC address starting 00:09:C1 was manufactured by or for PROCES-DATA A/S.