Which company owns MAC address prefix 10:2C:EF?

MAC address prefix 10:2C:EF is registered to EMU Electronic AG in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 10:2C:EF has a network interface built by EMU Electronic AG.

What is the OUI 10:2C:EF?

10:2C:EF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to EMU Electronic AG. It covers every address from 10:2C:EF:00:00:00 to 10:2C:EF:FF:FF:FF, or 16,777,216 addresses in total. It is also written 10-2C-EF.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 10:2C:EF:00:00:00 that is 10:2C:EF — 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 EMU Electronic AG located?

EMU Electronic AG is listed at Joechlerweg 2 Baar Zug CH 6340 in the IEEE OUI registry entry for 10:2C:EF. This is the address the organization registered with the IEEE, which may differ from its current operating address.

EMU Electronic AG

MAC address prefix 10:2C:EF is registered to EMU Electronic AG in the IEEE OUI registry. Any device whose MAC address begins with 10:2C:EF has a network interface built by EMU Electronic AG. 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 10:2C:EF:00:00:00 to 10:2C:EF:FF:FF:FF.

OUI prefix: 10:2C:EF
Hyphen form: 10-2C-EF
MAC range: 10:2C:EF:00:00:00 – 10:2C:EF:FF:FF:FF
Addresses in block: 16,777,216
Organization: EMU Electronic AG
Address: Joechlerweg 2 Baar Zug CH 6340
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.

2021-06-10Assigned to "EMU Electronic AG"
archived source →
2026-07-17Assigned to "EMU Electronic AG"

Nearby in the registry

The prefixes assigned immediately before and after 10:2C:EF:

FAQ

Which company owns MAC address prefix 10:2C:EF?: MAC address prefix 10:2C:EF is registered to EMU Electronic AG in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 10:2C:EF has a network interface built by EMU Electronic AG.
What is the OUI 10:2C:EF?: 10:2C:EF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to EMU Electronic AG. It covers every address from 10:2C:EF:00:00:00 to 10:2C:EF:FF:FF:FF, or 16,777,216 addresses in total. It is also written 10-2C-EF.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 10:2C:EF:00:00:00 that is 10:2C:EF — 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 EMU Electronic AG located?: EMU Electronic AG is listed at Joechlerweg 2 Baar Zug CH 6340 in the IEEE OUI registry entry for 10:2C:EF. This is the address the organization registered with the IEEE, which may differ from its current operating address.