Which company owns MAC address prefix 00:03:12?

MAC address prefix 00:03:12 is registered to TRsystems GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 00:03:12 has a network interface built by TRsystems GmbH.

What is the OUI 00:03:12?

00:03:12 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to TRsystems GmbH. It covers every address from 00:03:12:00:00:00 to 00:03:12:FF:FF:FF, or 16,777,216 addresses in total. It is also written 00-03-12.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 00:03:12:00:00:00 that is 00:03:12 — 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 TRsystems GmbH located?

TRsystems GmbH is listed at Eglishalde 16 Trossingen Baden-Wuerttemberg DE D-78647 in the IEEE OUI registry entry for 00:03:12. This is the address the organization registered with the IEEE, which may differ from its current operating address.

TRsystems GmbH

MAC address prefix 00:03:12 is registered to TRsystems GmbH in the IEEE OUI registry. Any device whose MAC address begins with 00:03:12 has a network interface built by TRsystems 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 00:03:12:00:00:00 to 00:03:12:FF:FF:FF.

OUI prefix: 00:03:12
Hyphen form: 00-03-12
MAC range: 00:03:12:00:00:00 – 00:03:12:FF:FF:FF
Addresses in block: 16,777,216
Organization: TRsystems GmbH
Address: Eglishalde 16 Trossingen Baden-Wuerttemberg DE D-78647
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 (3)

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 "TR-Systemtechnik GmbH"
archived source →
2019-07-04Renamed from "TR-Systemtechnik GmbH" to "TRsystems GmbH"
archived source →
2026-07-17Assigned to "TRsystems GmbH"

Nearby in the registry

The prefixes assigned immediately before and after 00:03:12:

FAQ

Which company owns MAC address prefix 00:03:12?: MAC address prefix 00:03:12 is registered to TRsystems GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 00:03:12 has a network interface built by TRsystems GmbH.
What is the OUI 00:03:12?: 00:03:12 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to TRsystems GmbH. It covers every address from 00:03:12:00:00:00 to 00:03:12:FF:FF:FF, or 16,777,216 addresses in total. It is also written 00-03-12.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 00:03:12:00:00:00 that is 00:03:12 — 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 TRsystems GmbH located?: TRsystems GmbH is listed at Eglishalde 16 Trossingen Baden-Wuerttemberg DE D-78647 in the IEEE OUI registry entry for 00:03:12. This is the address the organization registered with the IEEE, which may differ from its current operating address.