Which company owns MAC address prefix F4:6F:A4?

MAC address prefix F4:6F:A4 is registered to Physik Instrumente GmbH & Co. KG in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with F4:6F:A4 has a network interface built by Physik Instrumente GmbH & Co. KG.

What is the OUI F4:6F:A4?

F4:6F:A4 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Physik Instrumente GmbH & Co. KG. It covers every address from F4:6F:A4:00:00:00 to F4:6F:A4:FF:FF:FF, or 16,777,216 addresses in total. It is also written F4-6F-A4.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in F4:6F:A4:00:00:00 that is F4:6F:A4 — 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 Physik Instrumente GmbH & Co. KG located?

Physik Instrumente GmbH & Co. KG is listed at Auf der Roemerstr. 1 Karlsruhe DE 76228 in the IEEE OUI registry entry for F4:6F:A4. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Physik Instrumente GmbH & Co. KG

MAC address prefix F4:6F:A4 is registered to Physik Instrumente GmbH & Co. KG in the IEEE OUI registry. Any device whose MAC address begins with F4:6F:A4 has a network interface built by Physik Instrumente GmbH & 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 F4:6F:A4:00:00:00 to F4:6F:A4:FF:FF:FF.

OUI prefix: F4:6F:A4
Hyphen form: F4-6F-A4
MAC range: F4:6F:A4:00:00:00 – F4:6F:A4:FF:FF:FF
Addresses in block: 16,777,216
Organization: Physik Instrumente GmbH & Co. KG
Address: Auf der Roemerstr. 1 Karlsruhe DE 76228
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.

2021-02-25Assigned to "Physik Instrumente GmbH & Co. KG"
archived source →
2026-07-17Assigned to "Physik Instrumente GmbH & Co. KG"

Nearby in the registry

The prefixes assigned immediately before and after F4:6F:A4:

FAQ

Which company owns MAC address prefix F4:6F:A4?: MAC address prefix F4:6F:A4 is registered to Physik Instrumente GmbH & Co. KG in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with F4:6F:A4 has a network interface built by Physik Instrumente GmbH & Co. KG.
What is the OUI F4:6F:A4?: F4:6F:A4 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Physik Instrumente GmbH & Co. KG. It covers every address from F4:6F:A4:00:00:00 to F4:6F:A4:FF:FF:FF, or 16,777,216 addresses in total. It is also written F4-6F-A4.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in F4:6F:A4:00:00:00 that is F4:6F:A4 — 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 Physik Instrumente GmbH & Co. KG located?: Physik Instrumente GmbH & Co. KG is listed at Auf der Roemerstr. 1 Karlsruhe DE 76228 in the IEEE OUI registry entry for F4:6F:A4. This is the address the organization registered with the IEEE, which may differ from its current operating address.