What this means
The IEEE assigned the MA-L block 70533F to Alfa Instrumentos Eletronicos Ltda.. 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 70:53:3F, it is Alfa Instrumentos Eletronicos Ltda. hardware.
Frequently Asked Questions
Who owns MAC prefix 70533F?
70533F is registered to Alfa Instrumentos Eletronicos Ltda. 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. Alfa Instrumentos Eletronicos Ltda.'s block covers 16,777,216 addresses.
What devices use 70533F?
Any network device with a MAC address starting 70:53:3F was manufactured by or for Alfa Instrumentos Eletronicos Ltda..