What this means
The IEEE assigned the MA-L block 0021D0 to Global Display Solutions Spa. 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 00:21:D0, it is Global Display Solutions Spa hardware.
Frequently Asked Questions
Who owns MAC prefix 0021D0?
0021D0 is registered to Global Display Solutions Spa 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. Global Display Solutions Spa's block covers 16,777,216 addresses.
What devices use 0021D0?
Any network device with a MAC address starting 00:21:D0 was manufactured by or for Global Display Solutions Spa.