What this means
The IEEE assigned the MA-L block 0019A7 to ITU-T. 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 00:19:A7, it is ITU-T hardware.
Frequently Asked Questions
Who owns MAC prefix 0019A7?
0019A7 is registered to ITU-T 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. ITU-T's block covers 16,777,216 addresses.
What devices use 0019A7?
Any network device with a MAC address starting 00:19:A7 was manufactured by or for ITU-T.