Which company owns MAC address prefix C8:3D:FC?

MAC address prefix C8:3D:FC is registered to AlphaTheta Corporation in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C8:3D:FC has a network interface built by AlphaTheta Corporation.

What is the OUI C8:3D:FC?

C8:3D:FC is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to AlphaTheta Corporation. It covers every address from C8:3D:FC:00:00:00 to C8:3D:FC:FF:FF:FF, or 16,777,216 addresses in total. It is also written C8-3D-FC.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in C8:3D:FC:00:00:00 that is C8:3D:FC — 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 AlphaTheta Corporation located?

AlphaTheta Corporation is listed at 6F,Yokohama i-Mark Place, 4-4-5 Minatomirai, Nishi-ku Yokohama Kanagawa JP 220-0012 in the IEEE OUI registry entry for C8:3D:FC. This is the address the organization registered with the IEEE, which may differ from its current operating address.

AlphaTheta Corporation

MAC address prefix C8:3D:FC is registered to AlphaTheta Corporation in the IEEE OUI registry. Any device whose MAC address begins with C8:3D:FC has a network interface built by AlphaTheta Corporation. 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 C8:3D:FC:00:00:00 to C8:3D:FC:FF:FF:FF.

OUI prefix: C8:3D:FC
Hyphen form: C8-3D-FC
MAC range: C8:3D:FC:00:00:00 – C8:3D:FC:FF:FF:FF
Addresses in block: 16,777,216
Organization: AlphaTheta Corporation
Address: 6F,Yokohama i-Mark Place, 4-4-5 Minatomirai, Nishi-ku Yokohama Kanagawa JP 220-0012
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 (3)

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 "Pioneer DJ Corporation"
archived source →
2020-04-23Renamed from "Pioneer DJ Corporation" to "AlphaTheta Corporation"
archived source →
2026-07-17Assigned to "AlphaTheta Corporation"

Nearby in the registry

The prefixes assigned immediately before and after C8:3D:FC:

FAQ

Which company owns MAC address prefix C8:3D:FC?: MAC address prefix C8:3D:FC is registered to AlphaTheta Corporation in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C8:3D:FC has a network interface built by AlphaTheta Corporation.
What is the OUI C8:3D:FC?: C8:3D:FC is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to AlphaTheta Corporation. It covers every address from C8:3D:FC:00:00:00 to C8:3D:FC:FF:FF:FF, or 16,777,216 addresses in total. It is also written C8-3D-FC.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in C8:3D:FC:00:00:00 that is C8:3D:FC — 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 AlphaTheta Corporation located?: AlphaTheta Corporation is listed at 6F,Yokohama i-Mark Place, 4-4-5 Minatomirai, Nishi-ku Yokohama Kanagawa JP 220-0012 in the IEEE OUI registry entry for C8:3D:FC. This is the address the organization registered with the IEEE, which may differ from its current operating address.