What this means
The IEEE assigned the MA-L block 00021D to Data General Communication Ltd.. 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 00:02:1D, it is Data General Communication Ltd. hardware.
Frequently Asked Questions
Who owns MAC prefix 00021D?
00021D is registered to Data General Communication Ltd. 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. Data General Communication Ltd.'s block covers 16,777,216 addresses.
What devices use 00021D?
Any network device with a MAC address starting 00:02:1D was manufactured by or for Data General Communication Ltd..