Which company owns MAC address prefix C8:6C:B6?

MAC address prefix C8:6C:B6 is registered to Optcom Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C8:6C:B6 has a network interface built by Optcom Co., Ltd..

What is the OUI C8:6C:B6?

C8:6C:B6 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Optcom Co., Ltd.. It covers every address from C8:6C:B6:00:00:00 to C8:6C:B6:FF:FF:FF, or 16,777,216 addresses in total. It is also written C8-6C-B6.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in C8:6C:B6:00:00:00 that is C8:6C:B6 — 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 Optcom Co., Ltd. located?

Optcom Co., Ltd. is listed at 792-3 Tomigaoka Iwata Shizuoka JP 438-0803 in the IEEE OUI registry entry for C8:6C:B6. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Optcom Co., Ltd.

MAC address prefix C8:6C:B6 is registered to Optcom Co., Ltd. in the IEEE OUI registry. Any device whose MAC address begins with C8:6C:B6 has a network interface built by Optcom 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 C8:6C:B6:00:00:00 to C8:6C:B6:FF:FF:FF.

OUI prefix: C8:6C:B6
Hyphen form: C8-6C-B6
MAC range: C8:6C:B6:00:00:00 – C8:6C:B6:FF:FF:FF
Addresses in block: 16,777,216
Organization: Optcom Co., Ltd.
Address: 792-3 Tomigaoka Iwata Shizuoka JP 438-0803
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 "Optcom Co., Ltd."
archived source →
2026-07-17Assigned to "Optcom Co., Ltd."

Nearby in the registry

The prefixes assigned immediately before and after C8:6C:B6:

FAQ

Which company owns MAC address prefix C8:6C:B6?: MAC address prefix C8:6C:B6 is registered to Optcom Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C8:6C:B6 has a network interface built by Optcom Co., Ltd..
What is the OUI C8:6C:B6?: C8:6C:B6 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Optcom Co., Ltd.. It covers every address from C8:6C:B6:00:00:00 to C8:6C:B6:FF:FF:FF, or 16,777,216 addresses in total. It is also written C8-6C-B6.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in C8:6C:B6:00:00:00 that is C8:6C:B6 — 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 Optcom Co., Ltd. located?: Optcom Co., Ltd. is listed at 792-3 Tomigaoka Iwata Shizuoka JP 438-0803 in the IEEE OUI registry entry for C8:6C:B6. This is the address the organization registered with the IEEE, which may differ from its current operating address.