Which company owns MAC address prefix C0:F9:45?

MAC address prefix C0:F9:45 is registered to Toshiba Toko Meter Systems Co., LTD. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C0:F9:45 has a network interface built by Toshiba Toko Meter Systems Co., LTD..

What is the OUI C0:F9:45?

C0:F9:45 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Toshiba Toko Meter Systems Co., LTD.. It covers every address from C0:F9:45:00:00:00 to C0:F9:45:FF:FF:FF, or 16,777,216 addresses in total. It is also written C0-F9-45.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in C0:F9:45:00:00:00 that is C0:F9:45 — 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 Toshiba Toko Meter Systems Co., LTD. located?

Toshiba Toko Meter Systems Co., LTD. is listed at 3484, Sakuragaoka, Kurohama Hasuda-shi Saitama JP 349-0192 in the IEEE OUI registry entry for C0:F9:45. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Toshiba Toko Meter Systems Co., LTD.

MAC address prefix C0:F9:45 is registered to Toshiba Toko Meter Systems Co., LTD. in the IEEE OUI registry. Any device whose MAC address begins with C0:F9:45 has a network interface built by Toshiba Toko Meter Systems Co., LTD.. 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 C0:F9:45:00:00:00 to C0:F9:45:FF:FF:FF.

OUI prefix: C0:F9:45
Hyphen form: C0-F9-45
MAC range: C0:F9:45:00:00:00 – C0:F9:45:FF:FF:FF
Addresses in block: 16,777,216
Organization: Toshiba Toko Meter Systems Co., LTD.
Address: 3484, Sakuragaoka, Kurohama Hasuda-shi Saitama JP 349-0192
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.

Assignment history (2)

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

2016-07-29Assigned to "Toshiba Toko Meter Systems Co., LTD."
archived source →
2026-07-17Assigned to "Toshiba Toko Meter Systems Co., LTD."

Nearby in the registry

The prefixes assigned immediately before and after C0:F9:45:

FAQ

Which company owns MAC address prefix C0:F9:45?: MAC address prefix C0:F9:45 is registered to Toshiba Toko Meter Systems Co., LTD. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C0:F9:45 has a network interface built by Toshiba Toko Meter Systems Co., LTD..
What is the OUI C0:F9:45?: C0:F9:45 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Toshiba Toko Meter Systems Co., LTD.. It covers every address from C0:F9:45:00:00:00 to C0:F9:45:FF:FF:FF, or 16,777,216 addresses in total. It is also written C0-F9-45.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in C0:F9:45:00:00:00 that is C0:F9:45 — 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 Toshiba Toko Meter Systems Co., LTD. located?: Toshiba Toko Meter Systems Co., LTD. is listed at 3484, Sakuragaoka, Kurohama Hasuda-shi Saitama JP 349-0192 in the IEEE OUI registry entry for C0:F9:45. This is the address the organization registered with the IEEE, which may differ from its current operating address.