What this means
The IEEE assigned the MA-L block A4EF0C to Mellanox Technologies, 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:EF:0C, it is Mellanox Technologies, Inc. hardware.
Frequently Asked Questions
Who owns MAC prefix A4EF0C?
A4EF0C is registered to Mellanox Technologies, 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. Mellanox Technologies, Inc.'s block covers 16,777,216 addresses.
What devices use A4EF0C?
Any network device with a MAC address starting A4:EF:0C was manufactured by or for Mellanox Technologies, Inc..