| Prefix | Block | Addresses | First registered | Organization |
|---|---|---|---|---|
| 00:01:02 | MA-L | 16.8 million | 8 Sep 2000 | 3COM |
| 00:01:03 | MA-L | 16.8 million | 8 Sep 2000 | 3COM |
| 00:06:8C | MA-L | 16.8 million | 4 Jun 2001 | 3COM |
| 00:0A:5E | MA-L | 16.8 million | 3 Aug 2002 | 3COM |
| 00:10:4B | MA-L | 16.8 million | 22 Apr 1998 | 3COM |
| 00:10:5A | MA-L | 16.8 million | 22 Apr 1998 | 3COM |
| 00:20:AF | MA-L | 16.8 million | 22 Apr 1998 | 3COM |
| 00:26:54 | MA-L | 16.8 million | 3 Apr 2004 | 3COM |
| 00:50:04 | MA-L | 16.8 million | 8 Sep 2000 | 3COM |
| 00:50:DA | MA-L | 16.8 million | 8 Sep 2000 | 3COM |
| 00:60:08 | MA-L | 16.8 million | 22 Apr 1998 | 3COM |
| 00:60:8C | MA-L | 16.8 million | 22 Apr 1998 | 3COM |
| 00:60:97 | MA-L | 16.8 million | 22 Apr 1998 | 3COM |
| 00:A0:24 | MA-L | 16.8 million | 22 Apr 1998 | 3COM |
| 00:D0:D8 | MA-L | 16.8 million | 2 Feb 2001 | 3COM |
| 02:60:8C | MA-L | 16.8 million | 25 Sep 1998 | 3COM |
| 02:C0:8C | MA-L | 16.8 million | 8 Sep 2000 | 3COM |
Former 3COM CORPORATION MAC address blocks
The IEEE registry once carried 17 blocks registered to 3COM CORPORATION. All 17 blocks are now registered to 3COM. 3COM 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.