What this means
The IEEE assigned the MA-L block 00220B to National Source Coding Center. 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 00:22:0B, it is National Source Coding Center hardware.
Frequently Asked Questions
Who owns MAC prefix 00220B?
00220B is registered to National Source Coding Center 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. National Source Coding Center's block covers 16,777,216 addresses.
What devices use 00220B?
Any network device with a MAC address starting 00:22:0B was manufactured by or for National Source Coding Center.