Who owns MAC prefix 404101?

404101 is registered to Rockwell Automation in the IEEE MA-L registry.

What devices use 404101?

Any network device with a MAC address starting 40:41:01 was manufactured by or for Rockwell Automation.

MA-L · OUI prefix

Rockwell Automation

Any MAC address starting 40:41:01 is registered to Rockwell Automation in US.

OUI prefix	404101
Vendor	Rockwell Automation
Registry	MA-L (24-bit, large block)
Country	US
Example MAC	40:41:01:00:00:00

What this means

The IEEE assigned the MA-L block 404101 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 40:41:01, it is Rockwell Automation hardware.

Other Rockwell Automation prefixes

Rockwell Automation holds 14 registered blocks in total.

0000BC 001D9C 086195 184C08 34C0F9 44CC6E 5C2167 5C8816 68C8EB BCF499 E48EBB E49069 all 14 »

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