What this means
The IEEE assigned the MA-L block 18D9EF to Shuttle 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 18:D9:EF, it is Shuttle Inc. hardware.
Frequently Asked Questions
Who owns MAC prefix 18D9EF?
18D9EF is registered to Shuttle 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. Shuttle Inc.'s block covers 16,777,216 addresses.
What devices use 18D9EF?
Any network device with a MAC address starting 18:D9:EF was manufactured by or for Shuttle Inc..