Shanghai Reallytek Information Technology Co.,Ltd: MAC prefix assignment
Summary
- // what this is
- Shanghai Reallytek Information Technology is registered to MAC prefix
30:AA:BDand 1 more in the IEEE OUI database. When a device's MAC address begins with30:AA:BD, that block was registered by Shanghai Reallytek Information Technology — the OUI identifies the maker of the network hardware, which is not always the brand on the device. - // analyst note
- Both listed 24-bit prefixes have Group bit 0 and Local bit 0. Each leaves 24 suffix bits, or 16,777,216 possible suffix values; this is not a device or shipment count. A change to either first-byte bit changes the literal prefix match. A match indicates a registry assignment, not a specific device or deployment.
About this vendor.
A MAC address beginning 30:AA:BD or 80:19:67 matches an IEEE MA-L assignment recorded for Shanghai Reallytek Information Technology Co.,Ltd. That identifies the registry entry associated with the prefix; it does not establish the device type, product, operator, or safety of a device using the address.
Each prefix is 24 bits long, leaving 24 suffix bits and 16,777,216 possible suffix values per prefix. This is a count of possible values, not a device, shipment, or deployed-address count. Both literal prefixes have the Group bit and Local bit set to zero in their first byte. Changing either bit changes the prefix, so a modified address no longer matches that exact 24-bit prefix.
RFC 7042 describes 48-bit MAC identifiers as an initial OUI or other assigned prefix followed by additional bits, and explains the Group and Local bit meanings. The supplied IEEE records indicate China with CN. Assignment dates are unavailable in these IEEE CSV records.
- Device type
- Unknown from these assignments [Unknown] — https://standards-oui.ieee.org/oui/oui.csv
- Country
- China (
CNin the supplied records) [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv
- Company
- Shanghai Reallytek Information Technology Co.,Ltd [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv
- Prefixes
30:AA:BD,80:19:67[Confirmed] — https://standards-oui.ieee.org/oui/oui.csv- Registry
- MA-L [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv
- Country
- China [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv
- Device types
- 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