Aerosat Avionics — MAC prefix identifies a registry assignment
Summary
- // what this is
- Aerosat Avionics is registered to MAC prefix
00:21:23in the IEEE OUI database. When a device's MAC address begins with00:21:23, that block was registered by Aerosat Avionics — the OUI identifies the maker of the network hardware, which is not always the brand on the device. - // analyst note
- A MAC prefix match identifies the registry assignment; it does not identify a particular device, product, deployment, or security state. The 24-bit prefix leaves 24 suffix bits, representing 16,777,216 possible suffix values, not an observed device or shipment count. For this exact prefix, the first-octet Group and Local bits are both zero; changing either bit produces a different prefix.
About this vendor.
A MAC address beginning 00:21:23 matches the MA-L assignment registered to Aerosat Avionics. That identifies the registry entry associated with the prefix; it does not establish the device, product, current vendor identity, or security state that produced a captured address.
This 24-bit prefix leaves 24 bits for suffix values, or 16,777,216 possible values. That is a mathematical address-space count, not a count of devices, shipments, or addresses actually in use.
The first octet is 00: its Group bit and Local bit are both zero. These bits are fixed for this exact literal prefix. Turning either bit on changes the prefix, so the assignment does not establish an address’s behavior if the prefix differs. RFC 7042 describes these bits and the structure of 48-bit MAC identifiers.
- Registry match
- Aerosat Avionics, MA-L assignment
00:21:23[Confirmed] — https://standards-oui.ieee.org/oui/oui.csv - Prefix length
- 24 bits, with a 24-bit suffix [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv
- Device or product
- Unknown; the supplied evidence does not establish a device or product association [Unknown] — https://standards-oui.ieee.org/oui/oui.csv
- Company
- Aerosat Avionics [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv
- Device type
- Unknown [Unknown] — https://standards-oui.ieee.org/oui/oui.csv
- Country
- United States [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv
- Prefix interpretation
- First-octet Group bit and Local bit are zero for
00:21:23; changing either bit changes the prefix [Confirmed] — https://www.rfc-editor.org/rfc/rfc7042.txt - IEEE record date
- Assignment dates are unavailable in these IEEE CSV records. [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv