| Prefix | Block | Addresses | Country | First registered |
|---|---|---|---|---|
| 00:50:C2:C0:1 | IAB | 4.1 thousand | ES | 7 Feb 2010 |
| 00:50:C2:FD:C | IAB | 4.1 thousand | ES | 12 Aug 2012 |
| 70:B3:D5:03:D | MA-S | 4.1 thousand | ES | 30 Oct 2016 |
| 70:B3:D5:40:B | MA-S | 4.1 thousand | ES | 27 Feb 2019 |
| 70:B3:D5:4C:1 | MA-S | 4.1 thousand | ES | 23 Feb 2014 |
| 70:B3:D5:77:7 | MA-S | 4.1 thousand | ES | 22 Oct 2017 |
| 70:B3:D5:A1:2 | MA-S | 4.1 thousand | ES | 26 Jul 2015 |
| 70:B3:D5:FF:B | MA-S | 4.1 thousand | ES | 11 Mar 2023 |
| 8C:1F:64:9B:9 | MA-S | 4.1 thousand | ES | 20 Jul 2023 |
| 8C:1F:64:B9:A | MA-S | 4.1 thousand | ES | 16 May 2021 |
| 8C:1F:64:D7:C | MA-S | 4.1 thousand | ES | 5 Mar 2022 |
Every block registered to QUERCUS TECHNOLOGIES, S.L. in the IEEE registries, complete. Free-text search also matches former owners.