| Prefix | Block | Addresses | First registered | Organization |
|---|---|---|---|---|
| 00:02:55 | MA-L | 16.8 million | 8 Sep 2000 | IBM Corp |
| 00:06:29 | MA-L | 16.8 million | 22 Apr 1998 | IBM Corp |
| 00:09:6B | MA-L | 16.8 million | 29 Mar 2002 | IBM Corp |
| 00:0D:60 | MA-L | 16.8 million | 1 Jun 2003 | IBM Corp |
| 00:11:25 | MA-L | 16.8 million | 25 Apr 2004 | IBM Corp |
| 00:20:35 | MA-L | 16.8 million | 8 Sep 2000 | IBM Corp |
| 08:00:5A | MA-L | 16.8 million | 8 Sep 2000 | IBM Corp |
| 10:00:5A | MA-L | 16.8 million | 8 Sep 2000 | IBM Corp |
Former IBM CORPORATION MAC address blocks
The IEEE registry once carried 8 blocks registered to IBM CORPORATION. All 8 blocks are now registered to IBM Corp. IBM Corp 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.