IEEE Registry
CID: Company ID
A 24 bit identifier that looks like an OUI but is explicitly not for globally unique addresses. The local bit is set, so CID addresses are locally administered by definition.
Prefix
24 bits
Block size
16,777,216
Assignments
219
0.4% of the registry
Organizations
214
Also known as
The IEEE renamed these blocks in 2014. You will still see the older name CID in vendor documentation, network tooling, and most written material about MAC addresses. They refer to the same thing.
Example CID assignments
| Prefix | Organization | Size |
|---|---|---|
| 0A:2A:33 | DIGISTOR | 16,777,216 addresses |
| 0A:35:F2 | Integrated Technical Vision Ltd | 16,777,216 addresses |
| 0A:36:1C | Smardii | 16,777,216 addresses |
| 0A:58:FB | Purple WiFi Limited | 16,777,216 addresses |
| 0A:87:36 | IEEE 1901 Working Group | 16,777,216 addresses |
| 0A:8E:62 | Delta Solutions LLC | 16,777,216 addresses |
| 0A:93:26 | Qorvo, Inc. | 16,777,216 addresses |
| 0A:9E:66 | Distance Technologies Ltd | 16,777,216 addresses |
| 0A:A2:3B | Vitex LLC | 16,777,216 addresses |
| 0A:AB:8C | Midwest Microwave Solutions Inc. | 16,777,216 addresses |
| 0A:CD:8F | Cisco Systems Norway | 16,777,216 addresses |
| 0A:D9:C4 | Craft Designs, Inc | 16,777,216 addresses |
See the database statistics for how the registries compare, or browse every assignment.