What this means
The IEEE assigned the MA-L block 78491D to The Will-Burt Company. 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 78:49:1D, it is The Will-Burt Company hardware.
Frequently Asked Questions
Who owns MAC prefix 78491D?
78491D is registered to The Will-Burt Company 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. The Will-Burt Company's block covers 16,777,216 addresses.
What devices use 78491D?
Any network device with a MAC address starting 78:49:1D was manufactured by or for The Will-Burt Company.