What this means
The IEEE assigned the MA-L block 400107 to Arista Corp. 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 40:01:07, it is Arista Corp hardware.
Frequently Asked Questions
Who owns MAC prefix 400107?
400107 is registered to Arista Corp 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. Arista Corp's block covers 16,777,216 addresses.
What devices use 400107?
Any network device with a MAC address starting 40:01:07 was manufactured by or for Arista Corp.