What this means
The IEEE assigned the MA-L block 0019B3 to Stanford Research 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 00:19:B3, it is Stanford Research Systems hardware.
Frequently Asked Questions
Who owns MAC prefix 0019B3?
0019B3 is registered to Stanford Research Systems 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. Stanford Research Systems's block covers 16,777,216 addresses.
What devices use 0019B3?
Any network device with a MAC address starting 00:19:B3 was manufactured by or for Stanford Research Systems.