Which company owns MAC address prefix C0:B3:57?

MAC address prefix C0:B3:57 is registered to Yoshiki Electronics Industry Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C0:B3:57 has a network interface built by Yoshiki Electronics Industry Ltd..

What is the OUI C0:B3:57?

C0:B3:57 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Yoshiki Electronics Industry Ltd.. It covers every address from C0:B3:57:00:00:00 to C0:B3:57:FF:FF:FF, or 16,777,216 addresses in total. It is also written C0-B3-57.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in C0:B3:57:00:00:00 that is C0:B3:57 — 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 Yoshiki Electronics Industry Ltd. located?

Yoshiki Electronics Industry Ltd. is listed at Ooicyoyo Building 7f Shinagawa-ku Tokyo JP 140-0011 in the IEEE OUI registry entry for C0:B3:57. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Yoshiki Electronics Industry Ltd.

MAC address prefix C0:B3:57 is registered to Yoshiki Electronics Industry Ltd. in the IEEE OUI registry. Any device whose MAC address begins with C0:B3:57 has a network interface built by Yoshiki Electronics Industry 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:B3:57:00:00:00 to C0:B3:57:FF:FF:FF.

OUI prefix: C0:B3:57
Hyphen form: C0-B3-57
MAC range: C0:B3:57:00:00:00 – C0:B3:57:FF:FF:FF
Addresses in block: 16,777,216
Organization: Yoshiki Electronics Industry Ltd.
Address: Ooicyoyo Building 7f Shinagawa-ku Tokyo JP 140-0011
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 "Yoshiki Electronics Industry Ltd."
archived source →
2026-07-17Assigned to "Yoshiki Electronics Industry Ltd."

Nearby in the registry

The prefixes assigned immediately before and after C0:B3:57:

FAQ

Which company owns MAC address prefix C0:B3:57?: MAC address prefix C0:B3:57 is registered to Yoshiki Electronics Industry Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C0:B3:57 has a network interface built by Yoshiki Electronics Industry Ltd..
What is the OUI C0:B3:57?: C0:B3:57 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Yoshiki Electronics Industry Ltd.. It covers every address from C0:B3:57:00:00:00 to C0:B3:57:FF:FF:FF, or 16,777,216 addresses in total. It is also written C0-B3-57.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in C0:B3:57:00:00:00 that is C0:B3:57 — 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 Yoshiki Electronics Industry Ltd. located?: Yoshiki Electronics Industry Ltd. is listed at Ooicyoyo Building 7f Shinagawa-ku Tokyo JP 140-0011 in the IEEE OUI registry entry for C0:B3:57. This is the address the organization registered with the IEEE, which may differ from its current operating address.