What this means
The IEEE assigned the MA-L block 34C0F9 to Rockwell Automation. 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 34:C0:F9, it is Rockwell Automation hardware.
Frequently Asked Questions
Who owns MAC prefix 34C0F9?
34C0F9 is registered to Rockwell Automation 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. Rockwell Automation's block covers 16,777,216 addresses.
What devices use 34C0F9?
Any network device with a MAC address starting 34:C0:F9 was manufactured by or for Rockwell Automation.