What this means
The IEEE assigned the MA-L block 00057C to RCO Security AB. 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 00:05:7C, it is RCO Security AB hardware.
Frequently Asked Questions
Who owns MAC prefix 00057C?
00057C is registered to RCO Security AB 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. RCO Security AB's block covers 16,777,216 addresses.
What devices use 00057C?
Any network device with a MAC address starting 00:05:7C was manufactured by or for RCO Security AB.