What this means
The IEEE assigned the MA-L block 00131F to NxtPhase T&D, Corp.. 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 00:13:1F, it is NxtPhase T&D, Corp. hardware.
Frequently Asked Questions
Who owns MAC prefix 00131F?
00131F is registered to NxtPhase T&D, Corp. in the IEEE MA-L registry.
What does the MA-L registry type mean?
An MA-L assignment, the IEEE's original OUI format, gives the vendor the first three octets and 16,777,216 device addresses under them. NxtPhase T&D, Corp.'s block covers 16,777,216 addresses.
What devices use 00131F?
Any network device with a MAC address starting 00:13:1F was manufactured by or for NxtPhase T&D, Corp..