Who owns MAC prefix 40F3851?

40F3851 is registered to Johnson Matthey in the IEEE MA-M registry.

What devices use 40F3851?

Any network device with a MAC address starting 40:F3:85:1 was manufactured by or for Johnson Matthey.

MA-M · OUI prefix

Johnson Matthey

Any MAC address starting 40:F3:85:1 is registered to Johnson Matthey.

OUI prefix	40F3851
Vendor	Johnson Matthey
Registry	MA-M (28-bit, medium block)
Example MAC	40:F3:85:1:00:00:00

What this means

The IEEE assigned the MA-M block 40F3851 to Johnson Matthey. 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 40:F3:85:1, it is Johnson Matthey hardware.

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