Who owns MAC prefix C4EEF5?

C4EEF5 is registered to II-VI Incorporated in the IEEE MA-L registry.

What devices use C4EEF5?

Any network device with a MAC address starting C4:EE:F5 was manufactured by or for II-VI Incorporated.

MA-L · OUI prefix

II-VI Incorporated

Any MAC address starting C4:EE:F5 is registered to II-VI Incorporated in US.

OUI prefix	C4EEF5
Vendor	II-VI Incorporated
Registry	MA-L (24-bit, large block)
Country	US
Example MAC	C4:EE:F5:00:00:00

What this means

The IEEE assigned the MA-L block C4EEF5 to II-VI Incorporated. 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:EE:F5, it is II-VI Incorporated hardware.

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