Which company owns MAC address prefix 84:AC:FB?

MAC address prefix 84:AC:FB is registered to Crouzet Automatismes in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 84:AC:FB has a network interface built by Crouzet Automatismes.

What is the OUI 84:AC:FB?

84:AC:FB is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Crouzet Automatismes. It covers every address from 84:AC:FB:00:00:00 to 84:AC:FB:FF:FF:FF, or 16,777,216 addresses in total. It is also written 84-AC-FB.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 84:AC:FB:00:00:00 that is 84:AC: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 Crouzet Automatismes located?

Crouzet Automatismes is listed at 2 rue du docteur Abel Valence France FR 26902 in the IEEE OUI registry entry for 84:AC:FB. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Crouzet Automatismes

MAC address prefix 84:AC:FB is registered to Crouzet Automatismes in the IEEE OUI registry. Any device whose MAC address begins with 84:AC:FB has a network interface built by Crouzet Automatismes. 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 84:AC:FB:00:00:00 to 84:AC:FB:FF:FF:FF.

OUI prefix: 84:AC:FB
Hyphen form: 84-AC-FB
MAC range: 84:AC:FB:00:00:00 – 84:AC:FB:FF:FF:FF
Addresses in block: 16,777,216
Organization: Crouzet Automatismes
Address: 2 rue du docteur Abel Valence France FR 26902
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 "Crouzet Automatismes"
archived source →
2026-07-17Assigned to "Crouzet Automatismes"

Nearby in the registry

The prefixes assigned immediately before and after 84:AC:FB:

FAQ

Which company owns MAC address prefix 84:AC:FB?: MAC address prefix 84:AC:FB is registered to Crouzet Automatismes in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 84:AC:FB has a network interface built by Crouzet Automatismes.
What is the OUI 84:AC:FB?: 84:AC:FB is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Crouzet Automatismes. It covers every address from 84:AC:FB:00:00:00 to 84:AC:FB:FF:FF:FF, or 16,777,216 addresses in total. It is also written 84-AC-FB.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 84:AC:FB:00:00:00 that is 84:AC: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 Crouzet Automatismes located?: Crouzet Automatismes is listed at 2 rue du docteur Abel Valence France FR 26902 in the IEEE OUI registry entry for 84:AC:FB. This is the address the organization registered with the IEEE, which may differ from its current operating address.