A3M Co., LTD MAC Prefix Identification
Summary
- // what this is
- A3M is registered to MAC prefix
FC:E1:86in the IEEE OUI database. When a device's MAC address begins withFC:E1:86, that block was registered by A3M — the OUI identifies the maker of the network hardware, which is not always the brand on the device. - // analyst note
- A MAC beginning FC:E1:86 matches the 24-bit MA-L assignment. The first-octet Group and Local bits are both zero and remain fixed for this exact prefix; changing either bit produces a different prefix. The remaining 24 bits allow 16,777,216 possible suffix values, which is not an observed device or shipment count. A prefix match establishes only the matching registry assignment, not a particular device, deployment, operator, or security state. RFC 7042 describes MAC identifiers as an assigned initial prefix followed by additional bits.
About this vendor.
A MAC address beginning FC:E1:86 matches the IEEE MA-L assignment to A3M Co., LTD. The supplied evidence does not identify a device category or a specific product associated with this prefix, so the matching prefix identifies the registry assignment rather than a particular device or deployment.
The assignment is 24 bits long, leaving 24 bits for suffix values: 16,777,216 possible values within this prefix. This is an arithmetic range, not a count of devices or shipments. The first octet FC has the Group bit and Local bit both clear. These bits are fixed for an exact prefix match; changing either bit changes the prefix.
RFC 7042 describes 48-bit MAC identifiers as an assigned initial prefix followed by additional bits. A captured address matching FC:E1:86 can establish that its first 24 bits match this assignment, but cannot by itself establish the device, operator, traffic prevalence, or security state.
- Identification
- IEEE MA-L assignment
FC:E1:86is registered to A3M Co., LTD. [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv - Device category
- Unknown; no supplied evidence maps a device category to this exact prefix. [Unknown] — https://standards-oui.ieee.org/oui/oui.csv
- Assignment size
- One 24-bit prefix, with 24 suffix bits and 16,777,216 possible suffix values. [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv
- Bit interpretation
- The Group and Local bits in the first octet are both zero for this prefix; they are fixed for an exact literal prefix match. [Confirmed] — https://www.rfc-editor.org/rfc/rfc7042.txt
- Country
- KR appears in the supplied registry address, but the publication evidence does not provide an unambiguous country name. [Unknown] — https://standards-oui.ieee.org/oui/oui.csv
- Company
- A3M Co., LTD [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv
- Registry
- MA-L [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv
- Prefix
- FC:E1:86 [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv
- Country
- Unknown [Unknown] — https://standards-oui.ieee.org/oui/oui.csv
- Device types
- Unknown [Unknown] — https://standards-oui.ieee.org/oui/oui.csv