What this means
The IEEE assigned the MA-L block 30F42F to ESP. 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 30:F4:2F, it is ESP hardware.
Frequently Asked Questions
Who owns MAC prefix 30F42F?
30F42F is registered to ESP 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. ESP's block covers 16,777,216 addresses.
What devices use 30F42F?
Any network device with a MAC address starting 30:F4:2F was manufactured by or for ESP.