Which company owns MAC address prefix CC:B5:5A?

MAC address prefix CC:B5:5A is registered to Fraunhofer ITWM in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with CC:B5:5A has a network interface built by Fraunhofer ITWM.

What is the OUI CC:B5:5A?

CC:B5:5A is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Fraunhofer ITWM. It covers every address from CC:B5:5A:00:00:00 to CC:B5:5A:FF:FF:FF, or 16,777,216 addresses in total. It is also written CC-B5-5A.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in CC:B5:5A:00:00:00 that is CC:B5:5A — 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 Fraunhofer ITWM located?

Fraunhofer ITWM is listed at Fraunhoferplatz 1 Kaiserslautern Rhineland-Palatinae DE 67663 in the IEEE OUI registry entry for CC:B5:5A. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Fraunhofer ITWM

MAC address prefix CC:B5:5A is registered to Fraunhofer ITWM in the IEEE OUI registry. Any device whose MAC address begins with CC:B5:5A has a network interface built by Fraunhofer ITWM. 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:B5:5A:00:00:00 to CC:B5:5A:FF:FF:FF.

OUI prefix: CC:B5:5A
Hyphen form: CC-B5-5A
MAC range: CC:B5:5A:00:00:00 – CC:B5:5A:FF:FF:FF
Addresses in block: 16,777,216
Organization: Fraunhofer ITWM
Address: Fraunhoferplatz 1 Kaiserslautern Rhineland-Palatinae DE 67663
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.

2016-07-29Assigned to "Fraunhofer ITWM"
archived source →
2026-07-17Assigned to "Fraunhofer ITWM"

Nearby in the registry

The prefixes assigned immediately before and after CC:B5:5A:

FAQ

Which company owns MAC address prefix CC:B5:5A?: MAC address prefix CC:B5:5A is registered to Fraunhofer ITWM in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with CC:B5:5A has a network interface built by Fraunhofer ITWM.
What is the OUI CC:B5:5A?: CC:B5:5A is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Fraunhofer ITWM. It covers every address from CC:B5:5A:00:00:00 to CC:B5:5A:FF:FF:FF, or 16,777,216 addresses in total. It is also written CC-B5-5A.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in CC:B5:5A:00:00:00 that is CC:B5:5A — 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 Fraunhofer ITWM located?: Fraunhofer ITWM is listed at Fraunhoferplatz 1 Kaiserslautern Rhineland-Palatinae DE 67663 in the IEEE OUI registry entry for CC:B5:5A. This is the address the organization registered with the IEEE, which may differ from its current operating address.