| Prefix | Block | Addresses | Country | First registered |
|---|---|---|---|---|
| 00:50:C2:39:B | IAB | 4.1 thousand | JP | 30 Jul 2008 |
| 00:50:C2:A2:E | IAB | 4.1 thousand | JP | 18 Jan 2009 |
| 00:50:C2:EE:C | IAB | 4.1 thousand | JP | 4 Dec 2011 |
| 40:D8:55:0F:F | IAB | 4.1 thousand | JP | 26 May 2013 |
| 70:B3:D5:15:0 | MA-S | 4.1 thousand | JP | 20 Dec 2018 |
| 70:B3:D5:19:6 | MA-S | 4.1 thousand | JP | 30 Dec 2020 |
| 70:B3:D5:1F:2 | MA-S | 4.1 thousand | JP | 25 Dec 2019 |
| 70:B3:D5:2D:E | MA-S | 4.1 thousand | JP | 30 Sep 2018 |
| 70:B3:D5:5C:8 | MA-S | 4.1 thousand | JP | 19 Oct 2014 |
| 70:B3:D5:74:2 | MA-S | 4.1 thousand | JP | 21 Feb 2016 |
| 70:B3:D5:85:F | MA-S | 4.1 thousand | JP | 13 May 2018 |
| 70:B3:D5:9C:7 | MA-S | 4.1 thousand | JP | 2 Oct 2016 |
| 70:B3:D5:B2:2 | MA-S | 4.1 thousand | JP | 25 Jul 2020 |
| 70:B3:D5:B6:A | MA-S | 4.1 thousand | JP | 26 Feb 2017 |
| 70:B3:D5:BB:B | MA-S | 4.1 thousand | JP | 22 Jun 2019 |
| 70:B3:D5:BD:4 | MA-S | 4.1 thousand | JP | 12 Feb 2019 |
| 70:B3:D5:C2:B | MA-S | 4.1 thousand | JP | 1 Jan 2020 |
| 70:B3:D5:CA:D | MA-S | 4.1 thousand | JP | 20 Dec 2020 |
| 70:B3:D5:CB:A | MA-S | 4.1 thousand | JP | 23 Sep 2018 |
| 70:B3:D5:D0:6 | MA-S | 4.1 thousand | JP | 4 Jun 2020 |
| 70:B3:D5:DB:4 | MA-S | 4.1 thousand | JP | 1 Nov 2015 |
| 70:B3:D5:E8:6 | MA-S | 4.1 thousand | JP | 22 Oct 2017 |
| 8C:1F:64:03:E | MA-S | 4.1 thousand | JP | 2 Apr 2026 |
| 8C:1F:64:12:D | MA-S | 4.1 thousand | JP | 12 Jun 2024 |
| 8C:1F:64:24:E | MA-S | 4.1 thousand | JP | 11 Jul 2025 |
| 8C:1F:64:2A:4 | MA-S | 4.1 thousand | JP | 14 Feb 2024 |
| 8C:1F:64:2C:6 | MA-S | 4.1 thousand | JP | 1 Sep 2022 |
| 8C:1F:64:32:9 | MA-S | 4.1 thousand | JP | 29 Dec 2022 |
| 8C:1F:64:35:7 | MA-S | 4.1 thousand | JP | 8 Apr 2025 |
| 8C:1F:64:49:8 | MA-S | 4.1 thousand | JP | 24 Oct 2021 |
| 8C:1F:64:5A:C | MA-S | 4.1 thousand | JP | 5 Apr 2022 |
| 8C:1F:64:5C:F | MA-S | 4.1 thousand | JP | 21 Nov 2025 |
| 8C:1F:64:65:A | MA-S | 4.1 thousand | JP | 21 Oct 2025 |
| 8C:1F:64:70:A | MA-S | 4.1 thousand | JP | 26 Aug 2025 |
| 8C:1F:64:8B:E | MA-S | 4.1 thousand | JP | 11 Feb 2025 |
| 8C:1F:64:8C:A | MA-S | 4.1 thousand | JP | 24 Aug 2024 |
| 8C:1F:64:90:6 | MA-S | 4.1 thousand | JP | 19 May 2026 |
| 8C:1F:64:9F:5 | MA-S | 4.1 thousand | JP | 9 Mar 2023 |
| 8C:1F:64:A4:A | MA-S | 4.1 thousand | JP | 10 Dec 2024 |
| 8C:1F:64:A6:2 | MA-S | 4.1 thousand | JP | 13 Jul 2026 |
| 8C:1F:64:AD:2 | MA-S | 4.1 thousand | JP | 4 Aug 2021 |
| 8C:1F:64:AE:1 | MA-S | 4.1 thousand | JP | 29 May 2021 |
| 8C:1F:64:B5:A | MA-S | 4.1 thousand | JP | 8 Jul 2023 |
| 8C:1F:64:C5:E | MA-S | 4.1 thousand | JP | 4 May 2024 |
| 8C:1F:64:CF:A | MA-S | 4.1 thousand | JP | 19 Oct 2022 |
| 8C:1F:64:CF:B | MA-S | 4.1 thousand | JP | 25 Jul 2023 |
| 8C:1F:64:D4:2 | MA-S | 4.1 thousand | JP | 28 Jan 2023 |
| 8C:1F:64:EA:F | MA-S | 4.1 thousand | JP | 2 Feb 2026 |
| 8C:1F:64:F6:8 | MA-S | 4.1 thousand | JP | 15 Dec 2023 |
| 8C:1F:64:F7:9 | MA-S | 4.1 thousand | JP | 20 Dec 2022 |
Every block registered to YUYAMA MFG Co.,Ltd in the IEEE registries, complete. Free-text search also matches former owners.