IEEE Registry
MA-M: MAC Address Block Medium
A 28 bit block. Sixteen of these fit inside one 24 bit prefix, so the first three octets are shared with other registrants.
Prefix
28 bits
Block size
1,048,576
Assignments
6,584
11.3% of the registry
Organizations
6,058
Also known as
The IEEE renamed these blocks in 2014. You will still see the older name OUI-28 in vendor documentation, network tooling, and most written material about MAC addresses. They refer to the same thing.
Example MA-M assignments
| Prefix | Organization | Size |
|---|---|---|
| 00:55:DA:0 | Shinko Technos co.,ltd. | 1,048,576 addresses |
| 00:55:DA:1 | KoolPOS Inc. | 1,048,576 addresses |
| 00:55:DA:2 | Beijing Connected Information Technology Co.,Ltd. | 1,048,576 addresses |
| 00:55:DA:3 | Novexx Solutions GmbH | 1,048,576 addresses |
| 00:55:DA:4 | Datapath Limited | 1,048,576 addresses |
| 00:55:DA:5 | Nanoleaf | 1,048,576 addresses |
| 00:55:DA:6 | OOO DEKATRON | 1,048,576 addresses |
| 00:55:DA:7 | LUCISTECHNOLOGIES（SHANGHAI）CO.,LTD | 1,048,576 addresses |
| 00:55:DA:8 | BroadSoft, Inc. | 1,048,576 addresses |
| 00:55:DA:9 | Quantum Communication Technology Co., Ltd.,Anhui | 1,048,576 addresses |
| 00:55:DA:A | Speechlab | 1,048,576 addresses |
| 00:55:DA:B | Interaxon Inc | 1,048,576 addresses |
See the database statistics for how the registries compare, or browse every assignment.