What this means
The IEEE assigned the MA-M block 3009F9C to Honeywell. 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 30:09:F9:C, it is Honeywell hardware.
Frequently Asked Questions
Who owns MAC prefix 3009F9C?
3009F9C is registered to Honeywell in the IEEE MA-M registry.
What does the MA-M registry type mean?
An MA-M assignment covers 28 bits of the address, giving the vendor 1,048,576 device addresses, a quarter of a full MA-L block. Honeywell's block covers 1,048,576 addresses.
What devices use 3009F9C?
Any network device with a MAC address starting 30:09:F9:C was manufactured by or for Honeywell.