What this means
The IEEE assigned the MA-M block 303D51D to XOR UK Corporation Limited. 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:D, it is XOR UK Corporation Limited hardware.
Frequently Asked Questions
Who owns MAC prefix 303D51D?
303D51D is registered to XOR UK Corporation Limited 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. XOR UK Corporation Limited's block covers 1,048,576 addresses.
What devices use 303D51D?
Any network device with a MAC address starting 30:3D:51:D was manufactured by or for XOR UK Corporation Limited.