| Prefix | Block | Addresses | Country | First registered |
|---|---|---|---|---|
| 00:50:C2:70:F | IAB | 4.1 thousand | CH | 30 Jul 2008 |
| 70:B3:D5:7B:4 | MA-S | 4.1 thousand | CH | 15 May 2016 |
| 70:B3:D5:B1:0 | MA-S | 4.1 thousand | CH | 19 Aug 2018 |
| 70:B3:D5:C1:9 | MA-S | 4.1 thousand | CH | 10 Mar 2021 |
| 8C:1F:64:D5:8 | MA-S | 4.1 thousand | CH | 31 Aug 2024 |
| 8C:1F:64:EA:8 | MA-S | 4.1 thousand | CH | 21 Oct 2022 |
Every block registered to Zumbach Electronic AG in the IEEE registries, complete. Free-text search also matches former owners.