| Prefix | Block | Addresses | First registered | Organization |
|---|---|---|---|---|
| 00:0A:04 | MA-L | 16.8 million | 5 Jun 2002 | 3Com Ltd |
| 00:0B:AC | MA-L | 16.8 million | 19 Nov 2002 | 3Com Ltd |
| 00:0D:54 | MA-L | 16.8 million | 1 Jun 2003 | 3Com Ltd |
| 00:0E:6A | MA-L | 16.8 million | 21 Dec 2003 | 3Com Ltd |
| 00:0F:CB | MA-L | 16.8 million | 17 Mar 2004 | 3Com Ltd |
| 00:12:A9 | MA-L | 16.8 million | 21 Oct 2004 | 3Com Ltd |
| 00:14:7C | MA-L | 16.8 million | 7 May 2005 | 3Com Ltd |
| 00:16:E0 | MA-L | 16.8 million | 23 Dec 2005 | 3Com Ltd |
| 00:18:6E | MA-L | 16.8 million | 13 Jun 2006 | 3Com Ltd |
Former 3Com Europe Ltd MAC address blocks
The IEEE registry once carried 9 blocks registered to 3Com Europe Ltd. All 9 blocks are now registered to 3Com Ltd. 3Com Ltd 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.