3J Tech. Co., Ltd. — MAC prefix identification

A MAC address beginning 00:09:B5 matches an IEEE MA-L assignment registered to 3J Tech. Co., Ltd.; the supplied records do not identify a device type or product for this prefix.

The assignment is 24 bits long, leaving 24 bits for the remaining address. That gives 16,777,216 possible suffix values, not a count of devices, shipments, or addresses actually in use. A match indicates the registered prefix only; it cannot by itself establish who made a particular device or its current identity or security state.

For this exact prefix, the first octet 00 has Group bit 0 and Local bit 0. The matching boundary is the first 24 bits: those bits must match 00:09:B5. Setting either bit produces a different prefix, not a variation within this fixed assignment. RFC 7042 explains the Group and Local bit interpretation for MAC identifiers.

The IEEE CSV record includes a Taiwan indication, but the supplied evidence does not establish product categories, industry, or a company website. Assignment dates are unavailable in these IEEE CSV records.

MAC prefix

00:09:B5 (MA-L, 24-bit assignment) [Confirmed]

Device type

Unknown; no device category is mapped to this prefix in the supplied evidence.

Address interpretation

Group bit 0; Local bit 0; first 24 bits must match. There are 16,777,216 possible 24-bit suffix values. [Confirmed]

Assignment date

Unavailable in the supplied IEEE CSV records.

Company

3J Tech. Co., Ltd. [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv

Prefix

00:09:B5 (MA-L) [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv

Country

Taiwan [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv

Device type

Unknown [Unknown] — https://standards-oui.ieee.org/oui/oui.csv

Assignment date

Assignment dates are unavailable in these IEEE CSV records. [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv