Which company owns MAC address prefix 9C:47:F9?

MAC address prefix 9C:47:F9 is registered to LJU Automatisierungstechnik GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 9C:47:F9 has a network interface built by LJU Automatisierungstechnik GmbH.

What is the OUI 9C:47:F9?

9C:47:F9 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to LJU Automatisierungstechnik GmbH. It covers every address from 9C:47:F9:00:00:00 to 9C:47:F9:FF:FF:FF, or 16,777,216 addresses in total. It is also written 9C-47-F9.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 9C:47:F9:00:00:00 that is 9C:47:F9 — 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 LJU Automatisierungstechnik GmbH located?

LJU Automatisierungstechnik GmbH is listed at Am Schlahn 1 Potsdam Brandenburg DE D-14476 in the IEEE OUI registry entry for 9C:47:F9. This is the address the organization registered with the IEEE, which may differ from its current operating address.

LJU Automatisierungstechnik GmbH

MAC address prefix 9C:47:F9 is registered to LJU Automatisierungstechnik GmbH in the IEEE OUI registry. Any device whose MAC address begins with 9C:47:F9 has a network interface built by LJU Automatisierungstechnik GmbH. 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 9C:47:F9:00:00:00 to 9C:47:F9:FF:FF:FF.

OUI prefix: 9C:47:F9
Hyphen form: 9C-47-F9
MAC range: 9C:47:F9:00:00:00 – 9C:47:F9:FF:FF:FF
Addresses in block: 16,777,216
Organization: LJU Automatisierungstechnik GmbH
Address: Am Schlahn 1 Potsdam Brandenburg DE D-14476
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.

2022-07-11Assigned to "LJU Automatisierungstechnik GmbH"
archived source →
2026-07-17Assigned to "LJU Automatisierungstechnik GmbH"

Nearby in the registry

The prefixes assigned immediately before and after 9C:47:F9:

FAQ

Which company owns MAC address prefix 9C:47:F9?: MAC address prefix 9C:47:F9 is registered to LJU Automatisierungstechnik GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 9C:47:F9 has a network interface built by LJU Automatisierungstechnik GmbH.
What is the OUI 9C:47:F9?: 9C:47:F9 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to LJU Automatisierungstechnik GmbH. It covers every address from 9C:47:F9:00:00:00 to 9C:47:F9:FF:FF:FF, or 16,777,216 addresses in total. It is also written 9C-47-F9.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 9C:47:F9:00:00:00 that is 9C:47:F9 — 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 LJU Automatisierungstechnik GmbH located?: LJU Automatisierungstechnik GmbH is listed at Am Schlahn 1 Potsdam Brandenburg DE D-14476 in the IEEE OUI registry entry for 9C:47:F9. This is the address the organization registered with the IEEE, which may differ from its current operating address.