Which company owns MAC address prefix 54:F6:66?

MAC address prefix 54:F6:66 is registered to Berthold Technologies GmbH and Co.KG in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 54:F6:66 has a network interface built by Berthold Technologies GmbH and Co.KG.

What is the OUI 54:F6:66?

54:F6:66 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Berthold Technologies GmbH and Co.KG. It covers every address from 54:F6:66:00:00:00 to 54:F6:66:FF:FF:FF, or 16,777,216 addresses in total. It is also written 54-F6-66.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 54:F6:66:00:00:00 that is 54:F6:66 — 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 Berthold Technologies GmbH and Co.KG located?

Berthold Technologies GmbH and Co.KG is listed at Calmbacher Strasse 22 Bad Wildbad DE 75323 in the IEEE OUI registry entry for 54:F6:66. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Berthold Technologies GmbH and Co.KG

MAC address prefix 54:F6:66 is registered to Berthold Technologies GmbH and Co.KG in the IEEE OUI registry. Any device whose MAC address begins with 54:F6:66 has a network interface built by Berthold Technologies GmbH and Co.KG. 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 54:F6:66:00:00:00 to 54:F6:66:FF:FF:FF.

OUI prefix: 54:F6:66
Hyphen form: 54-F6-66
MAC range: 54:F6:66:00:00:00 – 54:F6:66:FF:FF:FF
Addresses in block: 16,777,216
Organization: Berthold Technologies GmbH and Co.KG
Address: Calmbacher Strasse 22 Bad Wildbad DE 75323
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 "Berthold Technologies GmbH and Co.KG"
archived source →
2026-07-17Assigned to "Berthold Technologies GmbH and Co.KG"

Nearby in the registry

The prefixes assigned immediately before and after 54:F6:66:

FAQ

Which company owns MAC address prefix 54:F6:66?: MAC address prefix 54:F6:66 is registered to Berthold Technologies GmbH and Co.KG in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 54:F6:66 has a network interface built by Berthold Technologies GmbH and Co.KG.
What is the OUI 54:F6:66?: 54:F6:66 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Berthold Technologies GmbH and Co.KG. It covers every address from 54:F6:66:00:00:00 to 54:F6:66:FF:FF:FF, or 16,777,216 addresses in total. It is also written 54-F6-66.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 54:F6:66:00:00:00 that is 54:F6:66 — 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 Berthold Technologies GmbH and Co.KG located?: Berthold Technologies GmbH and Co.KG is listed at Calmbacher Strasse 22 Bad Wildbad DE 75323 in the IEEE OUI registry entry for 54:F6:66. This is the address the organization registered with the IEEE, which may differ from its current operating address.