What this means
The IEEE assigned the MA-S block 70B3D5789 to SEMEX-EngCon GmbH. Every network interface they manufacture under this block has a MAC address beginning with these digits, followed by a unique per-device identifier. If a device on your network shows a MAC starting 70:B3:D5:78:9, it is SEMEX-EngCon GmbH hardware.
Frequently Asked Questions
Who owns MAC prefix 70B3D5789?
70B3D5789 is registered to SEMEX-EngCon GmbH in the IEEE MA-S registry.
What does the MA-S registry type mean?
An MA-S assignment, formerly called OUI-36, covers 36 bits, giving the vendor 4,096 device addresses, the smallest block the IEEE issues. SEMEX-EngCon GmbH's block covers 4,096 addresses.
What devices use 70B3D5789?
Any network device with a MAC address starting 70:B3:D5:78:9 was manufactured by or for SEMEX-EngCon GmbH.