Who owns MAC prefix 6431399?

6431399 is registered to Honeywell Analytics Ltd in the IEEE MA-M registry.

What devices use 6431399?

Any network device with a MAC address starting 64:31:39:9 was manufactured by or for Honeywell Analytics Ltd.

MA-M · OUI prefix

Honeywell Analytics Ltd

Any MAC address starting 64:31:39:9 is registered to Honeywell Analytics Ltd.

OUI prefix	6431399
Vendor	Honeywell Analytics Ltd
Registry	MA-M (28-bit, medium block)
Example MAC	64:31:39:9:00:00:00

What this means

The IEEE assigned the MA-M block 6431399 to Honeywell Analytics Ltd. 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 64:31:39:9, it is Honeywell Analytics Ltd hardware.

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