What this means
The IEEE assigned the MA-L block 507B91 to Sigmastar Technology Ltd.. 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 50:7B:91, it is Sigmastar Technology Ltd. hardware.
Frequently Asked Questions
Who owns MAC prefix 507B91?
507B91 is registered to Sigmastar Technology Ltd. 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. Sigmastar Technology Ltd.'s block covers 16,777,216 addresses.
What devices use 507B91?
Any network device with a MAC address starting 50:7B:91 was manufactured by or for Sigmastar Technology Ltd..