What this means
The IEEE assigned the MA-L block 00004D to DCI CORPORATION. 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 00:00:4D, it is DCI CORPORATION hardware.
Frequently Asked Questions
Who owns MAC prefix 00004D?
00004D is registered to DCI CORPORATION 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. DCI CORPORATION's block covers 16,777,216 addresses.
What devices use 00004D?
Any network device with a MAC address starting 00:00:4D was manufactured by or for DCI CORPORATION.