IEEE Registry
MA-L: MAC Address Block Large
The classic 24 bit OUI. The registrant owns the first three octets and can assign every one of the remaining 16.7 million addresses.
Prefix
24 bits
Block size
16,777,216
Assignments
39,696
68.1% of the registry
Organizations
20,094
Also known as
The IEEE renamed these blocks in 2014. You will still see the older name OUI in vendor documentation, network tooling, and most written material about MAC addresses. They refer to the same thing.
Example MA-L assignments
| Prefix | Organization | Size |
|---|---|---|
| 00:00:00 | XEROX CORPORATION | 16,777,216 addresses |
| 00:00:01 | XEROX CORPORATION | 16,777,216 addresses |
| 00:00:02 | XEROX CORPORATION | 16,777,216 addresses |
| 00:00:03 | XEROX CORPORATION | 16,777,216 addresses |
| 00:00:04 | XEROX CORPORATION | 16,777,216 addresses |
| 00:00:05 | XEROX CORPORATION | 16,777,216 addresses |
| 00:00:06 | XEROX CORPORATION | 16,777,216 addresses |
| 00:00:07 | XEROX CORPORATION | 16,777,216 addresses |
| 00:00:08 | XEROX CORPORATION | 16,777,216 addresses |
| 00:00:09 | XEROX CORPORATION | 16,777,216 addresses |
| 00:00:0A | OMRON TATEISI ELECTRONICS CO. | 16,777,216 addresses |
| 00:00:0B | MATRIX CORPORATION | 16,777,216 addresses |
See the database statistics for how the registries compare, or browse every assignment.