What this means
The IEEE assigned the MA-S block 70B3D51AB to Access Control Systems JSC. 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:D5:1A:B, it is Access Control Systems JSC hardware.
Frequently Asked Questions
Who owns MAC prefix 70B3D51AB?
70B3D51AB is registered to Access Control Systems JSC 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. Access Control Systems JSC's block covers 4,096 addresses.
What devices use 70B3D51AB?
Any network device with a MAC address starting 70:B3:D5:1A:B was manufactured by or for Access Control Systems JSC.