What this means
The IEEE assigned the MA-S block 70B3D53ED to Ultra Electronics Sonar System Division. 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:D5:3E:D, it is Ultra Electronics Sonar System Division hardware.
Frequently Asked Questions
Who owns MAC prefix 70B3D53ED?
70B3D53ED is registered to Ultra Electronics Sonar System Division 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. Ultra Electronics Sonar System Division's block covers 4,096 addresses.
What devices use 70B3D53ED?
Any network device with a MAC address starting 70:B3:D5:3E:D was manufactured by or for Ultra Electronics Sonar System Division.