What this means
The IEEE assigned the MA-L block D046DC to Southwest Research Institute. 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 D0:46:DC, it is Southwest Research Institute hardware.
Frequently Asked Questions
Who owns MAC prefix D046DC?
D046DC is registered to Southwest Research Institute 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. Southwest Research Institute's block covers 16,777,216 addresses.
What devices use D046DC?
Any network device with a MAC address starting D0:46:DC was manufactured by or for Southwest Research Institute.