MAC Address Lookup
Find the vendor name of a device by entering an OUI or a MAC address
GS
IEEE Registrant 30 Prefixes
Grossenbacher Systeme AG
Grossenbacher Systeme AG, accessible at www.gesys.ch, manages 30 unique MAC address prefixes. These prefixes have a total block size of 122.8 thousand addresses.
The allocation includes the following types: IAB(Individual Address Block) and MA-S(MAC Address Block Small, previously named OUI-36, encompasses IAB assignments, 4,096 addresses each).
The company registered its MAC address allocation on 21 February 2011, and the most recent update was made on 03 August 2026. These allocations support network identification and communication globally.
Unique prefixes 30
Block Size 122850 (122.85 k)
First registration 21 February 2011
Last updated 03 August 2026
Entity Details
Unique prefixes 30
Block Size 122850 (122.85 k)
Website www.gesys.ch
First registration 21 February 2011
Last updated 03 August 2026
Types
IAB: Block Type
Individual Address Blocks. Number of address 2^24 (~16 Million)MA-S: Block Type
Mac Address Block Small (previously named OUI-36, encompasses IAB Assignments). Number of address 2^12 (4096)Registered MAC Prefixes
All Organizationally Unique Identifiers and MAC ranges assigned to this vendor
| MAC Prefix | Type | Registration Date |
|---|---|---|
| 00:50:C2:02:9 | IAB | 2011-02-21 |
| 00:50:C2:41:0 | IAB | 2011-02-21 |
| 00:50:C2:A6:2 | IAB | 2011-02-21 |
| 00:50:C2:F1:D | IAB | 2012-03-15 |
| 40:D8:55:0F:1 | IAB | 2013-05-16 |
| 70:B3:D5:0D:E | MA-S | 2017-07-23 |
| 70:B3:D5:0E:8 | MA-S | 2017-01-07 |
| 70:B3:D5:29:7 | MA-S | 2016-02-18 |
| 70:B3:D5:3E:B | MA-S | 2019-07-04 |
| 70:B3:D5:5E:2 | MA-S | 2016-11-26 |
| 70:B3:D5:5F:E | MA-S | 2020-05-27 |
| 70:B3:D5:6B:7 | MA-S | 2018-02-15 |
| 70:B3:D5:75:8 | MA-S | 2018-06-14 |
| 70:B3:D5:80:3 | MA-S | 2018-12-16 |
| 70:B3:D5:A9:2 | MA-S | 2015-04-29 |
| 70:B3:D5:B7:5 | MA-S | 2020-01-18 |
| 70:B3:D5:BB:5 | MA-S | 2019-03-01 |
| 70:B3:D5:C9:1 | MA-S | 2016-04-24 |
| 70:B3:D5:CE:8 | MA-S | 2020-12-11 |
| 8C:1F:64:11:7 | MA-S | 2022-08-18 |
| 8C:1F:64:20:D | MA-S | 2023-10-19 |
| 8C:1F:64:36:3 | MA-S | 2025-04-28 |
| 8C:1F:64:83:A | MA-S | 2021-05-26 |
| 8C:1F:64:8D:F | MA-S | 2023-01-18 |
| 8C:1F:64:99:B | MA-S | 2026-02-18 |
| 8C:1F:64:9F:4 | MA-S | 2022-05-04 |
| 8C:1F:64:AF:9 | MA-S | 2024-05-29 |
| 8C:1F:64:B1:8 | MA-S | 2024-01-24 |
| 8C:1F:64:B2:E | MA-S | 2026-08-03 |
| 8C:1F:64:E4:1 | MA-S | 2021-10-08 |