Which company owns MAC address prefix 5C:FA:FB?

MAC address prefix 5C:FA:FB is registered to Acubit in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 5C:FA:FB has a network interface built by Acubit.

What is the OUI 5C:FA:FB?

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

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 5C:FA:FB:00:00:00 that is 5C:FA:FB — 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 Acubit located?

Acubit is listed at Afred Nobels Vej 21A Aalborg Ø DK 9220 in the IEEE OUI registry entry for 5C:FA:FB. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Acubit

MAC address prefix 5C:FA:FB is registered to Acubit in the IEEE OUI registry. Any device whose MAC address begins with 5C:FA:FB has a network interface built by Acubit. 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 5C:FA:FB:00:00:00 to 5C:FA:FB:FF:FF:FF.

OUI prefix: 5C:FA:FB
Hyphen form: 5C-FA-FB
MAC range: 5C:FA:FB:00:00:00 – 5C:FA:FB:FF:FF:FF
Addresses in block: 16,777,216
Organization: Acubit
Address: Afred Nobels Vej 21A Aalborg Ø DK 9220
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.

2019-07-04Assigned to "Acubit"
archived source →
2026-07-17Assigned to "Acubit"

Nearby in the registry

The prefixes assigned immediately before and after 5C:FA:FB:

FAQ

Which company owns MAC address prefix 5C:FA:FB?: MAC address prefix 5C:FA:FB is registered to Acubit in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 5C:FA:FB has a network interface built by Acubit.
What is the OUI 5C:FA:FB?: 5C:FA:FB is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Acubit. It covers every address from 5C:FA:FB:00:00:00 to 5C:FA:FB:FF:FF:FF, or 16,777,216 addresses in total. It is also written 5C-FA-FB.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 5C:FA:FB:00:00:00 that is 5C:FA:FB — 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 Acubit located?: Acubit is listed at Afred Nobels Vej 21A Aalborg Ø DK 9220 in the IEEE OUI registry entry for 5C:FA:FB. This is the address the organization registered with the IEEE, which may differ from its current operating address.