Which company owns MAC address prefix 74:6F:3D?

MAC address prefix 74:6F:3D is registered to Contec GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 74:6F:3D has a network interface built by Contec GmbH.

What is the OUI 74:6F:3D?

74:6F:3D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Contec GmbH. It covers every address from 74:6F:3D:00:00:00 to 74:6F:3D:FF:FF:FF, or 16,777,216 addresses in total. It is also written 74-6F-3D.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 74:6F:3D:00:00:00 that is 74:6F:3D — 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 Contec GmbH located?

Contec GmbH is listed at Oberahrer Straße 9 Sainerholz RP DE 56244 in the IEEE OUI registry entry for 74:6F:3D. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Contec GmbH

MAC address prefix 74:6F:3D is registered to Contec GmbH in the IEEE OUI registry. Any device whose MAC address begins with 74:6F:3D has a network interface built by Contec 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 74:6F:3D:00:00:00 to 74:6F:3D:FF:FF:FF.

OUI prefix: 74:6F:3D
Hyphen form: 74-6F-3D
MAC range: 74:6F:3D:00:00:00 – 74:6F:3D:FF:FF:FF
Addresses in block: 16,777,216
Organization: Contec GmbH
Address: Oberahrer Straße 9 Sainerholz RP DE 56244
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 "Contec GmbH"
archived source →
2026-07-17Assigned to "Contec GmbH"

Nearby in the registry

The prefixes assigned immediately before and after 74:6F:3D:

FAQ

Which company owns MAC address prefix 74:6F:3D?: MAC address prefix 74:6F:3D is registered to Contec GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 74:6F:3D has a network interface built by Contec GmbH.
What is the OUI 74:6F:3D?: 74:6F:3D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Contec GmbH. It covers every address from 74:6F:3D:00:00:00 to 74:6F:3D:FF:FF:FF, or 16,777,216 addresses in total. It is also written 74-6F-3D.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 74:6F:3D:00:00:00 that is 74:6F:3D — 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 Contec GmbH located?: Contec GmbH is listed at Oberahrer Straße 9 Sainerholz RP DE 56244 in the IEEE OUI registry entry for 74:6F:3D. This is the address the organization registered with the IEEE, which may differ from its current operating address.