Nanjing SAC Power Grid Automation Co., Ltd. MAC Prefixes
Summary
- // what this is
- Nanjing SAC Power Grid Automation is registered to MAC prefix
6C:83:66and 1 more in the IEEE OUI database. When a device's MAC address begins with6C:83:66, that block was registered by Nanjing SAC Power Grid Automation — the OUI identifies the maker of the network hardware, which is not always the brand on the device. - // analyst note
- The two listed 24-bit MA-L prefixes each leave a 24-bit suffix range of 16,777,216 possible values. Their first-octet Group and Local bits are 0; altering either bit changes the exact prefix. The suffix range is not a device or shipment count. Registry assignment alone does not identify a deployed device, product, traffic prevalence, current vendor identity, or security state.
About this vendor.
A MAC address beginning with 6C:83:66 or 20:DF:3F matches an IEEE MA-L assignment to Nanjing SAC Power Grid Automation Co., Ltd.; the records do not identify a specific device or product. Each prefix is 24 bits long, leaving 24 bits for the suffix. RFC 7042 describes the 48-bit MAC format and the Group and Local bits in the first octet.
For both listed prefixes, the first octet has Group bit 0 and Local bit 0. These bits are fixed for an exact prefix match: changing either bit changes the prefix. The 24-bit suffix has 16,777,216 possible values per prefix, a mathematical range rather than a count of devices, shipments, or observed addresses.
The IEEE registry records the organization name Nanjing SAC Power Grid Automation Co., Ltd. for two MA-L assignments. Both records list a registered address in Nanjing, Jiangsu, CN; this does not establish the company’s headquarters, incorporation, or current operating location. The supplied evidence does not identify products, industry, current identity, or a device category for these prefixes, and does not establish deployment prevalence or safety.
- Matching prefixes
6C:83:66and20:DF:3F[Confirmed] — https://standards-oui.ieee.org/oui/oui.csv- Device category
- Unknown from the supplied evidence [Unknown] — https://standards-oui.ieee.org/oui/oui.csv
- Company
- Nanjing SAC Power Grid Automation Co., Ltd. [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv
- Prefixes
6C:83:66,20:DF:3F[Confirmed] — https://standards-oui.ieee.org/oui/oui.csv- Registered-address country
- CN (both listed addresses are in Nanjing, Jiangsu) [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv
- Industry
- Unknown [Unknown] — https://standards-oui.ieee.org/oui/oui.csv
- Products
- Unknown [Unknown] — https://standards-oui.ieee.org/oui/oui.csv
- Device types
- Unknown [Unknown] — https://standards-oui.ieee.org/oui/oui.csv
- Website
- Unknown [Unknown] — https://standards-oui.ieee.org/oui/oui.csv
- Assignment dates
- Assignment dates are unavailable in these IEEE CSV records. [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv