A&D Co., Ltd. MAC prefix 00:09:1F: device type Unknown
Summary
- // what this is
- A&D is registered to MAC prefix
00:09:1Fin the IEEE OUI database. When a device's MAC address begins with00:09:1F, that block was registered by A&D — 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 only; it does not establish a particular device, product, observed deployment, traffic prevalence, current vendor identity, or security state. For
00:09:1F, the prefix is 24 bits, leaving 24 suffix bits and 16,777,216 possible suffix values, not an actual device or shipment count. Its first-octet Group and Local bits are both zero; either bit changing yields a different literal prefix.
About this vendor.
A MAC address beginning with 00:09:1F matches the IEEE MA-L assignment to A&D Co., Ltd.; the supplied evidence does not identify a device type or product for this prefix. This is a registry match and cannot establish which particular device sent a captured frame.
The assignment covers the first 24 bits of a 48-bit MAC address, leaving 24 bits after the prefix. Those remaining bits have 16,777,216 possible values, a mathematical range rather than a count of devices, shipments, or addresses observed in use.
The prefix’s first octet is 00: its Group bit and Local bit are both zero. For this exact literal prefix, those bits are fixed. Changing either bit produces a different prefix and does not describe variation within this assignment. RFC 7042 explains the role of these bits in MAC identifiers.
- Company
- A&D Co., Ltd. [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv
- Registry
- MA-L [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv
- Prefix
00:09:1F[Confirmed] — https://standards-oui.ieee.org/oui/oui.csv- Device type
- Unknown [Unknown] — https://standards-oui.ieee.org/oui/oui.csv