ZHEJIANG DAHUA ZHILIAN CO.,LTD: MAC prefix identifies a registry assignment; device type unknown
Summary
- // what this is
- Zhejiang Dahua Zhilian is registered to MAC prefix
20:2C:05and 1 more in the IEEE OUI database. When a device's MAC address begins with20:2C:05, that block was registered by Zhejiang Dahua Zhilian — the OUI identifies the maker of the network hardware, which is not always the brand on the device. - // analyst note
- Both 24-bit prefixes have first-byte Group bit 0 and Local bit 0; 24 suffix bits allow 16,777,216 possible values per prefix, which does not imply a device or shipment count. A matching prefix identifies the registry assignment only.
About this vendor.
A MAC address beginning with 20:2C:05 or A8:CA:87 matches an IEEE MA-L assignment to ZHEJIANG DAHUA ZHILIAN CO.,LTD. The available records do not identify a device category or product for either prefix, so the device type is unknown.
Each prefix is 24 bits long, leaving 24 bits for suffix values: 16,777,216 possible values per prefix. These are possible address suffixes, not a count of devices, shipments, or observed network activity. Both prefixes have Group bit 0 and Local bit 0 in their first byte. A captured address matching the full 24-bit prefix therefore has those bit values fixed; changing either bit produces a different prefix.
RFC 7042 describes the 48-bit MAC structure and the significance of the Group and Local bits. A matching prefix supports identification of the registry assignment, but does not establish a particular device, product, operating system, current legal identity, deployment, or security state. Assignment dates are unavailable in these IEEE CSV records.
- Full MA-L prefixes
20:2C:05andA8:CA:87[Confirmed] — https://standards-oui.ieee.org/oui/oui.csv- Device category
- Unknown; the supplied records do not map either prefix to a device category [Unknown] — https://standards-oui.ieee.org/oui/oui.csv