What this means
The IEEE assigned the MA-L block 443D21 to Nuvolt. 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 44:3D:21, it is Nuvolt hardware.
Frequently Asked Questions
Who owns MAC prefix 443D21?
443D21 is registered to Nuvolt 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. Nuvolt's block covers 16,777,216 addresses.
What devices use 443D21?
Any network device with a MAC address starting 44:3D:21 was manufactured by or for Nuvolt.