Which company owns MAC address prefix 8C:12:C2?

MAC address prefix 8C:12:C2 is registered to GLBB Japan in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 8C:12:C2 has a network interface built by GLBB Japan.

What is the OUI 8C:12:C2?

8C:12:C2 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to GLBB Japan. It covers every address from 8C:12:C2:00:00:00 to 8C:12:C2:FF:FF:FF, or 16,777,216 addresses in total. It is also written 8C-12-C2.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 8C:12:C2:00:00:00 that is 8C:12:C2 — 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 GLBB Japan located?

GLBB Japan is listed at 225-1 Hamagawa Chatan Okinawa JP 904-0112 in the IEEE OUI registry entry for 8C:12:C2. This is the address the organization registered with the IEEE, which may differ from its current operating address.

GLBB Japan

MAC address prefix 8C:12:C2 is registered to GLBB Japan in the IEEE OUI registry. Any device whose MAC address begins with 8C:12:C2 has a network interface built by GLBB Japan. 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 8C:12:C2:00:00:00 to 8C:12:C2:FF:FF:FF.

OUI prefix: 8C:12:C2
Hyphen form: 8C-12-C2
MAC range: 8C:12:C2:00:00:00 – 8C:12:C2:FF:FF:FF
Addresses in block: 16,777,216
Organization: GLBB Japan
Address: 225-1 Hamagawa Chatan Okinawa JP 904-0112
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.

2024-06-23Assigned to "GLBB Japan"
archived source →
2026-07-17Assigned to "GLBB Japan"

Nearby in the registry

The prefixes assigned immediately before and after 8C:12:C2:

FAQ

Which company owns MAC address prefix 8C:12:C2?: MAC address prefix 8C:12:C2 is registered to GLBB Japan in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 8C:12:C2 has a network interface built by GLBB Japan.
What is the OUI 8C:12:C2?: 8C:12:C2 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to GLBB Japan. It covers every address from 8C:12:C2:00:00:00 to 8C:12:C2:FF:FF:FF, or 16,777,216 addresses in total. It is also written 8C-12-C2.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 8C:12:C2:00:00:00 that is 8C:12:C2 — 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 GLBB Japan located?: GLBB Japan is listed at 225-1 Hamagawa Chatan Okinawa JP 904-0112 in the IEEE OUI registry entry for 8C:12:C2. This is the address the organization registered with the IEEE, which may differ from its current operating address.