What this means
The IEEE assigned the MA-S block 70B3D5FB1 to TOMEI TSUSHIN KOGYO CO,.LTD. 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:FB:1, it is TOMEI TSUSHIN KOGYO CO,.LTD hardware.
Frequently Asked Questions
Who owns MAC prefix 70B3D5FB1?
70B3D5FB1 is registered to TOMEI TSUSHIN KOGYO CO,.LTD 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. TOMEI TSUSHIN KOGYO CO,.LTD's block covers 4,096 addresses.
What devices use 70B3D5FB1?
Any network device with a MAC address starting 70:B3:D5:FB:1 was manufactured by or for TOMEI TSUSHIN KOGYO CO,.LTD.