Which company owns MAC address prefix 3C:6D:66?

MAC address prefix 3C:6D:66 is registered to NVIDIA Corporation in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 3C:6D:66 has a network interface built by NVIDIA Corporation.

What is the OUI 3C:6D:66?

3C:6D:66 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to NVIDIA Corporation. It covers every address from 3C:6D:66:00:00:00 to 3C:6D:66:FF:FF:FF, or 16,777,216 addresses in total. It is also written 3C-6D-66.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 3C:6D:66:00:00:00 that is 3C:6D:66 — 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 NVIDIA Corporation located?

NVIDIA Corporation is listed at 2701 San Tomas Expressway Santa Clara CA US 95050 in the IEEE OUI registry entry for 3C:6D:66. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does NVIDIA Corporation own?

NVIDIA Corporation holds 9 OUI prefixes in the IEEE registry, of which 3C:6D:66 is one. A device made by NVIDIA Corporation could carry a MAC address from any of them.

NVIDIA Corporation

MAC address prefix 3C:6D:66 is registered to NVIDIA Corporation in the IEEE OUI registry. Any device whose MAC address begins with 3C:6D:66 has a network interface built by NVIDIA 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 3C:6D:66:00:00:00 to 3C:6D:66:FF:FF:FF.

OUI prefix: 3C:6D:66
Hyphen form: 3C-6D-66
MAC range: 3C:6D:66:00:00:00 – 3C:6D:66:FF:FF:FF
Addresses in block: 16,777,216
Organization: NVIDIA Corporation
Address: 2701 San Tomas Expressway Santa Clara CA US 95050
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.

Other prefixes from NVIDIA Corporation

NVIDIA Corporation holds 9 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

Assignment history (2)

The IEEE registry publishes current state only — this is the change record we've kept since we started tracking it daily.

2024-02-15Assigned to "NVIDIA Corporation"
archived source →
2026-07-17Assigned to "NVIDIA Corporation"

Nearby in the registry

The prefixes assigned immediately before and after 3C:6D:66:

FAQ

Which company owns MAC address prefix 3C:6D:66?: MAC address prefix 3C:6D:66 is registered to NVIDIA Corporation in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 3C:6D:66 has a network interface built by NVIDIA Corporation.
What is the OUI 3C:6D:66?: 3C:6D:66 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to NVIDIA Corporation. It covers every address from 3C:6D:66:00:00:00 to 3C:6D:66:FF:FF:FF, or 16,777,216 addresses in total. It is also written 3C-6D-66.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 3C:6D:66:00:00:00 that is 3C:6D:66 — 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 NVIDIA Corporation located?: NVIDIA Corporation is listed at 2701 San Tomas Expressway Santa Clara CA US 95050 in the IEEE OUI registry entry for 3C:6D:66. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does NVIDIA Corporation own?: NVIDIA Corporation holds 9 OUI prefixes in the IEEE registry, of which 3C:6D:66 is one. A device made by NVIDIA Corporation could carry a MAC address from any of them.