Which company owns MAC address prefix 3C:CD:5A?

MAC address prefix 3C:CD:5A is registered to Technische Alternative GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 3C:CD:5A has a network interface built by Technische Alternative GmbH.

What is the OUI 3C:CD:5A?

3C:CD:5A is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Technische Alternative GmbH. It covers every address from 3C:CD:5A:00:00:00 to 3C:CD:5A:FF:FF:FF, or 16,777,216 addresses in total. It is also written 3C-CD-5A.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 3C:CD:5A:00:00:00 that is 3C:CD:5A — 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 Technische Alternative GmbH located?

Technische Alternative GmbH is listed at Langestr. 124 Amaliendorf Lower Austria AT A-3872 in the IEEE OUI registry entry for 3C:CD:5A. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Technische Alternative GmbH

MAC address prefix 3C:CD:5A is registered to Technische Alternative GmbH in the IEEE OUI registry. Any device whose MAC address begins with 3C:CD:5A has a network interface built by Technische Alternative 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 3C:CD:5A:00:00:00 to 3C:CD:5A:FF:FF:FF.

OUI prefix: 3C:CD:5A
Hyphen form: 3C-CD-5A
MAC range: 3C:CD:5A:00:00:00 – 3C:CD:5A:FF:FF:FF
Addresses in block: 16,777,216
Organization: Technische Alternative GmbH
Address: Langestr. 124 Amaliendorf Lower Austria AT A-3872
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 "Technische Alternative GmbH"
archived source →
2026-07-17Assigned to "Technische Alternative GmbH"

Nearby in the registry

The prefixes assigned immediately before and after 3C:CD:5A:

FAQ

Which company owns MAC address prefix 3C:CD:5A?: MAC address prefix 3C:CD:5A is registered to Technische Alternative GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 3C:CD:5A has a network interface built by Technische Alternative GmbH.
What is the OUI 3C:CD:5A?: 3C:CD:5A is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Technische Alternative GmbH. It covers every address from 3C:CD:5A:00:00:00 to 3C:CD:5A:FF:FF:FF, or 16,777,216 addresses in total. It is also written 3C-CD-5A.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 3C:CD:5A:00:00:00 that is 3C:CD:5A — 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 Technische Alternative GmbH located?: Technische Alternative GmbH is listed at Langestr. 124 Amaliendorf Lower Austria AT A-3872 in the IEEE OUI registry entry for 3C:CD:5A. This is the address the organization registered with the IEEE, which may differ from its current operating address.