| Prefix | Block | Addresses | Country | First registered |
|---|---|---|---|---|
| 00:BB:F0 | MA-L | 16.8 million | US | 8 Sep 2000 |
| 00:DD:00 | MA-L | 16.8 million | US | 8 Sep 2000 |
| 00:DD:01 | MA-L | 16.8 million | US | 8 Sep 2000 |
| 00:DD:02 | MA-L | 16.8 million | US | 8 Sep 2000 |
| 00:DD:03 | MA-L | 16.8 million | US | 8 Sep 2000 |
| 00:DD:04 | MA-L | 16.8 million | US | 8 Sep 2000 |
| 00:DD:05 | MA-L | 16.8 million | US | 8 Sep 2000 |
| 00:DD:06 | MA-L | 16.8 million | US | 8 Sep 2000 |
| 00:DD:07 | MA-L | 16.8 million | US | 8 Sep 2000 |
| 00:DD:08 | MA-L | 16.8 million | US | 8 Sep 2000 |
| 00:DD:09 | MA-L | 16.8 million | US | 8 Sep 2000 |
| 00:DD:0A | MA-L | 16.8 million | US | 8 Sep 2000 |
| 00:DD:0B | MA-L | 16.8 million | US | 8 Sep 2000 |
| 00:DD:0C | MA-L | 16.8 million | US | 8 Sep 2000 |
| 00:DD:0D | MA-L | 16.8 million | US | 8 Sep 2000 |
| 00:DD:0E | MA-L | 16.8 million | US | 8 Sep 2000 |
| 00:DD:0F | MA-L | 16.8 million | US | 8 Sep 2000 |
Every block registered to UNGERMANN-BASS INC. in the IEEE registries, complete. Free-text search also matches former owners.