What this means
The IEEE assigned the MA-L block 003081 to ALTOS C&C. 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 00:30:81, it is ALTOS C&C hardware.
Frequently Asked Questions
Who owns MAC prefix 003081?
003081 is registered to ALTOS C&C 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. ALTOS C&C's block covers 16,777,216 addresses.
What devices use 003081?
Any network device with a MAC address starting 00:30:81 was manufactured by or for ALTOS C&C.