Which company owns MAC address prefix CC:4D:38?

MAC address prefix CC:4D:38 is registered to Carnegie Technologies in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with CC:4D:38 has a network interface built by Carnegie Technologies.

What is the OUI CC:4D:38?

CC:4D:38 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Carnegie Technologies. It covers every address from CC:4D:38:00:00:00 to CC:4D:38:FF:FF:FF, or 16,777,216 addresses in total. It is also written CC-4D-38.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in CC:4D:38:00:00:00 that is CC:4D:38 — 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 Carnegie Technologies located?

Carnegie Technologies is listed at 9737 Great Hills Trail #260 Austin TX US 78759 in the IEEE OUI registry entry for CC:4D:38. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Carnegie Technologies

MAC address prefix CC:4D:38 is registered to Carnegie Technologies in the IEEE OUI registry. Any device whose MAC address begins with CC:4D:38 has a network interface built by Carnegie Technologies. 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 CC:4D:38:00:00:00 to CC:4D:38:FF:FF:FF.

OUI prefix: CC:4D:38
Hyphen form: CC-4D-38
MAC range: CC:4D:38:00:00:00 – CC:4D:38:FF:FF:FF
Addresses in block: 16,777,216
Organization: Carnegie Technologies
Address: 9737 Great Hills Trail #260 Austin TX US 78759
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.

2018-12-21Assigned to "Carnegie Technologies"
archived source →
2026-07-17Assigned to "Carnegie Technologies"

Nearby in the registry

The prefixes assigned immediately before and after CC:4D:38:

FAQ

Which company owns MAC address prefix CC:4D:38?: MAC address prefix CC:4D:38 is registered to Carnegie Technologies in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with CC:4D:38 has a network interface built by Carnegie Technologies.
What is the OUI CC:4D:38?: CC:4D:38 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Carnegie Technologies. It covers every address from CC:4D:38:00:00:00 to CC:4D:38:FF:FF:FF, or 16,777,216 addresses in total. It is also written CC-4D-38.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in CC:4D:38:00:00:00 that is CC:4D:38 — 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 Carnegie Technologies located?: Carnegie Technologies is listed at 9737 Great Hills Trail #260 Austin TX US 78759 in the IEEE OUI registry entry for CC:4D:38. This is the address the organization registered with the IEEE, which may differ from its current operating address.