AIJI System Co., Ltd. MAC Prefix Identification — 2026-11-06
Summary
- // what this is
- AIJI System is registered to MAC prefix
00:09:78in the IEEE OUI database. When a device's MAC address begins with00:09:78, that block was registered by AIJI System — the OUI identifies the maker of the network hardware, which is not always the brand on the device. - // analyst note
- A match identifies the MA-L registry assignment only; it does not establish a specific device, deployment, operator, or security state. The 24-bit prefix fixes first-octet Group and Local bits at 0; the remaining 24 bits allow 16,777,216 possible suffix values, not an actual device or shipment count.
About this vendor.
A MAC address beginning 00:09:78 matches an IEEE MA-L assignment to AIJI System Co., Ltd.; the supplied evidence does not identify a device category or product using it. This is a registry identification, not proof of who operates a device, where it is deployed, or whether it is safe. [https://standards-oui.ieee.org/oui/oui.csv]
The assignment is 24 bits long, so the prefix fixes the first three octets. The remaining 24 bits allow 16,777,216 possible suffix values; that number describes address possibilities, not devices or shipments. RFC 7042 explains that a 48-bit identifier can use an initial OUI followed by additional bits, and that the initial octet contains Group and Local bits. [https://www.rfc-editor.org/rfc/rfc7042.txt]
For this exact prefix, 00 has Group bit 0 and Local bit 0. Those values are fixed by the literal prefix match; changing either bit produces a different prefix. The supplied IEEE record includes KR, an unambiguous country indication, but provides no assignment date. [https://standards-oui.ieee.org/oui/oui.csv]
- Matching prefix
00:09:78(MA-L, 24 bits)- Device category
- Not established by the supplied evidence
- Country
- KR, as shown in the IEEE record
- Company
- AIJI System Co., Ltd. [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv
- Prefixes
00:09:78[Confirmed] — https://standards-oui.ieee.org/oui/oui.csv- Registry
- MA-L [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv
- Country
- KR [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv
- Assignment date
- Unavailable in the supplied IEEE CSV record [Unknown] — https://standards-oui.ieee.org/oui/oui.csv