What this means
The IEEE assigned the MA-L block 20DF3F to Nanjing SAC Power Grid Automation Co., 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 20:DF:3F, it is Nanjing SAC Power Grid Automation Co., Ltd. hardware.
Frequently Asked Questions
Who owns MAC prefix 20DF3F?
20DF3F is registered to Nanjing SAC Power Grid Automation Co., 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. Nanjing SAC Power Grid Automation Co., Ltd.'s block covers 16,777,216 addresses.
What devices use 20DF3F?
Any network device with a MAC address starting 20:DF:3F was manufactured by or for Nanjing SAC Power Grid Automation Co., Ltd..