What this means
The IEEE assigned the MA-M block 303D513 to S & A Systems. 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 30:3D:51:3, it is S & A Systems hardware.
Frequently Asked Questions
Who owns MAC prefix 303D513?
303D513 is registered to S & A Systems in the IEEE MA-M registry.
What does the MA-M registry type mean?
An MA-M assignment covers 28 bits of the address, giving the vendor 1,048,576 device addresses, a quarter of a full MA-L block. S & A Systems's block covers 1,048,576 addresses.
What devices use 303D513?
Any network device with a MAC address starting 30:3D:51:3 was manufactured by or for S & A Systems.