What this means
The IEEE assigned the MA-L block A40E2B to Facebook Inc. 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 A4:0E:2B, it is Facebook Inc hardware.
Frequently Asked Questions
Who owns MAC prefix A40E2B?
A40E2B is registered to Facebook Inc 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. Facebook Inc's block covers 16,777,216 addresses.
What devices use A40E2B?
Any network device with a MAC address starting A4:0E:2B was manufactured by or for Facebook Inc.