What this means
The IEEE assigned the MA-L block F449EF to EMSTONE. 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 F4:49:EF, it is EMSTONE hardware.
Frequently Asked Questions
Who owns MAC prefix F449EF?
F449EF is registered to EMSTONE 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. EMSTONE's block covers 16,777,216 addresses.
What devices use F449EF?
Any network device with a MAC address starting F4:49:EF was manufactured by or for EMSTONE.