What this means
The IEEE assigned the MA-L block E4EEFD to MR&D Manufacturing. 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 E4:EE:FD, it is MR&D Manufacturing hardware.
Frequently Asked Questions
Who owns MAC prefix E4EEFD?
E4EEFD is registered to MR&D Manufacturing 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. MR&D Manufacturing's block covers 16,777,216 addresses.
What devices use E4EEFD?
Any network device with a MAC address starting E4:EE:FD was manufactured by or for MR&D Manufacturing.