| Prefix | Block | Addresses | First registered | Organization |
|---|---|---|---|---|
| 00:01:30 | MA-L | 16.8 million | 8 Sep 2000 | Extreme Networks, Inc. |
| 00:04:96 | MA-L | 16.8 million | 4 Dec 2000 | Extreme Networks, Inc. |
| 00:E0:2B | MA-L | 16.8 million | 22 Apr 1998 | Extreme Networks, Inc. |
| 5C:0E:8B | MA-L | 16.8 million | 8 Nov 2016 | Extreme Networks, Inc. |
| 74:67:F7 | MA-L | 16.8 million | 8 Nov 2016 | Extreme Networks, Inc. |
| B4:C7:99 | MA-L | 16.8 million | 8 Nov 2016 | Extreme Networks, Inc. |
| B8:50:01 | MA-L | 16.8 million | 8 Nov 2016 | Extreme Networks, Inc. |
| D8:84:66 | MA-L | 16.8 million | 12 Aug 2014 | Extreme Networks, Inc. |
| FC:0A:81 | MA-L | 16.8 million | 8 Nov 2016 | Extreme Networks, Inc. |
Former Extreme Networks MAC address blocks
The IEEE registry once carried 9 blocks registered to Extreme Networks. All 9 blocks are now registered to Extreme Networks, Inc.. Extreme Networks, Inc. took over all of them.
Complete as of the current IEEE registry deploy. Dates are when each registration was first observed in public data, not legal assignment dates.