Which company owns MAC address prefix C8:A4:0D?

MAC address prefix C8:A4:0D is registered to Cooler Master Technology Inc in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C8:A4:0D has a network interface built by Cooler Master Technology Inc.

What is the OUI C8:A4:0D?

C8:A4:0D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Cooler Master Technology Inc. It covers every address from C8:A4:0D:00:00:00 to C8:A4:0D:FF:FF:FF, or 16,777,216 addresses in total. It is also written C8-A4-0D.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in C8:A4:0D:00:00:00 that is C8:A4:0D — 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 Cooler Master Technology Inc located?

Cooler Master Technology Inc is listed at 8F., No. 788-1, Zhongzheng Rd., Zhonghe Dist. New Taipei City New Taipei City TW 23586 in the IEEE OUI registry entry for C8:A4:0D. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Cooler Master Technology Inc

MAC address prefix C8:A4:0D is registered to Cooler Master Technology Inc in the IEEE OUI registry. Any device whose MAC address begins with C8:A4:0D has a network interface built by Cooler Master Technology Inc. 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:A4:0D:00:00:00 to C8:A4:0D:FF:FF:FF.

OUI prefix: C8:A4:0D
Hyphen form: C8-A4-0D
MAC range: C8:A4:0D:00:00:00 – C8:A4:0D:FF:FF:FF
Addresses in block: 16,777,216
Organization: Cooler Master Technology Inc
Address: 8F., No. 788-1, Zhongzheng Rd., Zhonghe Dist. New Taipei City New Taipei City TW 23586
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.

2020-11-28Assigned to "Cooler Master Technology Inc"
archived source →
2026-07-17Assigned to "Cooler Master Technology Inc"

Nearby in the registry

The prefixes assigned immediately before and after C8:A4:0D:

FAQ

Which company owns MAC address prefix C8:A4:0D?: MAC address prefix C8:A4:0D is registered to Cooler Master Technology Inc in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C8:A4:0D has a network interface built by Cooler Master Technology Inc.
What is the OUI C8:A4:0D?: C8:A4:0D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Cooler Master Technology Inc. It covers every address from C8:A4:0D:00:00:00 to C8:A4:0D:FF:FF:FF, or 16,777,216 addresses in total. It is also written C8-A4-0D.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in C8:A4:0D:00:00:00 that is C8:A4:0D — 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 Cooler Master Technology Inc located?: Cooler Master Technology Inc is listed at 8F., No. 788-1, Zhongzheng Rd., Zhonghe Dist. New Taipei City New Taipei City TW 23586 in the IEEE OUI registry entry for C8:A4:0D. This is the address the organization registered with the IEEE, which may differ from its current operating address.