Which company owns MAC address prefix 18:18:8B?

MAC address prefix 18:18:8B is registered to FCNT LLC in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 18:18:8B has a network interface built by FCNT LLC.

What is the OUI 18:18:8B?

18:18:8B is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to FCNT LLC. It covers every address from 18:18:8B:00:00:00 to 18:18:8B:FF:FF:FF, or 16,777,216 addresses in total. It is also written 18-18-8B.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 18:18:8B:00:00:00 that is 18:18:8B — and look that prefix up in the IEEE OUI registry. If the second-lowest bit of the first octet is set, the address is locally administered (a randomized or private MAC), which belongs to no manufacturer and will not resolve; modern phones and laptops use these by default on each network.

Where is FCNT LLC located?

FCNT LLC is listed at Sanki Yamato Building, 7-10-1 Chuorinkan Yamato Kanagawa JP 242-8588 in the IEEE OUI registry entry for 18:18:8B. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does FCNT LLC own?

FCNT LLC holds 3 OUI prefixes in the IEEE registry, of which 18:18:8B is one. A device made by FCNT LLC could carry a MAC address from any of them.

FCNT LLC

MAC address prefix 18:18:8B is registered to FCNT LLC in the IEEE OUI registry. Any device whose MAC address begins with 18:18:8B has a network interface built by FCNT LLC. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address — it covers every MAC from 18:18:8B:00:00:00 to 18:18:8B:FF:FF:FF.

OUI prefix: 18:18:8B
Hyphen form: 18-18-8B
MAC range: 18:18:8B:00:00:00 – 18:18:8B:FF:FF:FF
Addresses in block: 16,777,216
Organization: FCNT LLC
Address: Sanki Yamato Building, 7-10-1 Chuorinkan Yamato Kanagawa JP 242-8588
Source: IEEE OUI registry

Have a full MAC address? Look it up— we'll also tell you if it's a randomized (private) address rather than a real manufacturer prefix.

Other prefixes from FCNT LLC

FCNT LLC holds 3 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

Assignment history (4)

The IEEE registry publishes current state only — this is the change record we've kept since we started tracking it daily.

2020-11-28Assigned to "FUJITSU CONNECTED TECHNOLOGIES LIMITED"
archived source →
2022-09-05Renamed from "FUJITSU CONNECTED TECHNOLOGIES LIMITED" to "FCNT LMITED"
archived source →
2024-02-15Renamed from "FCNT LMITED" to "FCNT LLC"
archived source →
2026-07-17Assigned to "FCNT LLC"

Nearby in the registry

The prefixes assigned immediately before and after 18:18:8B:

FAQ

Which company owns MAC address prefix 18:18:8B?: MAC address prefix 18:18:8B is registered to FCNT LLC in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 18:18:8B has a network interface built by FCNT LLC.
What is the OUI 18:18:8B?: 18:18:8B is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to FCNT LLC. It covers every address from 18:18:8B:00:00:00 to 18:18:8B:FF:FF:FF, or 16,777,216 addresses in total. It is also written 18-18-8B.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 18:18:8B:00:00:00 that is 18:18:8B — and look that prefix up in the IEEE OUI registry. If the second-lowest bit of the first octet is set, the address is locally administered (a randomized or private MAC), which belongs to no manufacturer and will not resolve; modern phones and laptops use these by default on each network.
Where is FCNT LLC located?: FCNT LLC is listed at Sanki Yamato Building, 7-10-1 Chuorinkan Yamato Kanagawa JP 242-8588 in the IEEE OUI registry entry for 18:18:8B. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does FCNT LLC own?: FCNT LLC holds 3 OUI prefixes in the IEEE registry, of which 18:18:8B is one. A device made by FCNT LLC could carry a MAC address from any of them.