What this means
The IEEE assigned the MA-S block 70B3D5F70 to Honeywell. 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:F7:0, it is Honeywell hardware.
Frequently Asked Questions
Who owns MAC prefix 70B3D5F70?
70B3D5F70 is registered to Honeywell 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. Honeywell's block covers 4,096 addresses.
What devices use 70B3D5F70?
Any network device with a MAC address starting 70:B3:D5:F7:0 was manufactured by or for Honeywell.