What this means
The IEEE assigned the MA-S block 70B3D5D70 to Rational Production srl Unipersonale. 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:D7:0, it is Rational Production srl Unipersonale hardware.
Frequently Asked Questions
Who owns MAC prefix 70B3D5D70?
70B3D5D70 is registered to Rational Production srl Unipersonale 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. Rational Production srl Unipersonale's block covers 4,096 addresses.
What devices use 70B3D5D70?
Any network device with a MAC address starting 70:B3:D5:D7:0 was manufactured by or for Rational Production srl Unipersonale.