What this means
The IEEE assigned the MA-L block C40F09 to Hermes electronic 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 C4:0F:09, it is Hermes electronic GmbH hardware.
Frequently Asked Questions
Who owns MAC prefix C40F09?
C40F09 is registered to Hermes electronic 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. Hermes electronic GmbH's block covers 16,777,216 addresses.
What devices use C40F09?
Any network device with a MAC address starting C4:0F:09 was manufactured by or for Hermes electronic GmbH.