| Prefix | Block | Addresses | Country | First registered |
|---|---|---|---|---|
| 00:50:C2:49:D | IAB | 4.1 thousand | US | 30 Jul 2008 |
| 00:50:C2:8F:4 | IAB | 4.1 thousand | US | 30 Jul 2008 |
| 00:50:C2:E6:7 | IAB | 4.1 thousand | US | 7 Aug 2011 |
| 00:50:C2:FC:6 | IAB | 4.1 thousand | US | 15 Jul 2012 |
| 40:D8:55:17:C | IAB | 4.1 thousand | US | 22 Sep 2013 |
| 70:B3:D5:42:A | MA-S | 4.1 thousand | US | 18 Sep 2016 |
| 70:B3:D5:76:1 | MA-S | 4.1 thousand | US | 29 May 2016 |
| 70:B3:D5:AF:9 | MA-S | 4.1 thousand | US | 6 Sep 2015 |
| 70:B3:D5:B5:1 | MA-S | 4.1 thousand | US | 28 Jun 2015 |
| 70:B3:D5:D5:C | MA-S | 4.1 thousand | US | 22 Oct 2017 |
| 70:B3:D5:E5:E | MA-S | 4.1 thousand | US | 14 May 2017 |
| 70:B3:D5:EF:9 | MA-S | 4.1 thousand | US | 12 Jan 2014 |
| 70:B3:D5:F1:D | MA-S | 4.1 thousand | US | 22 Jan 2017 |
Every block registered to Critical Link LLC in the IEEE registries, complete. Free-text search also matches former owners.