Which company owns MAC address prefix 74:5C:4B?

MAC address prefix 74:5C:4B is registered to GN Audio A/S in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 74:5C:4B has a network interface built by GN Audio A/S.

What is the OUI 74:5C:4B?

74:5C:4B is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to GN Audio A/S. It covers every address from 74:5C:4B:00:00:00 to 74:5C:4B:FF:FF:FF, or 16,777,216 addresses in total. It is also written 74-5C-4B.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 74:5C:4B:00:00:00 that is 74:5C:4B — 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 GN Audio A/S located?

GN Audio A/S is listed at Lautrupbjerg 7 Ballerup DK DK-2750 in the IEEE OUI registry entry for 74:5C:4B. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does GN Audio A/S own?

GN Audio A/S holds 7 OUI prefixes in the IEEE registry, of which 74:5C:4B is one. A device made by GN Audio A/S could carry a MAC address from any of them.

GN Audio A/S

MAC address prefix 74:5C:4B is registered to GN Audio A/S in the IEEE OUI registry. Any device whose MAC address begins with 74:5C:4B has a network interface built by GN Audio A/S. 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 74:5C:4B:00:00:00 to 74:5C:4B:FF:FF:FF.

OUI prefix: 74:5C:4B
Hyphen form: 74-5C-4B
MAC range: 74:5C:4B:00:00:00 – 74:5C:4B:FF:FF:FF
Addresses in block: 16,777,216
Organization: GN Audio A/S
Address: Lautrupbjerg 7 Ballerup DK DK-2750
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.

Other prefixes from GN Audio A/S

GN Audio A/S holds 7 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

Assignment history (2)

The IEEE registry publishes current state only — this is the change record we've kept since we started tracking it daily.

2017-09-08Assigned to "GN Audio A/S"
archived source →
2026-07-17Assigned to "GN Audio A/S"

Nearby in the registry

The prefixes assigned immediately before and after 74:5C:4B:

FAQ

Which company owns MAC address prefix 74:5C:4B?: MAC address prefix 74:5C:4B is registered to GN Audio A/S in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 74:5C:4B has a network interface built by GN Audio A/S.
What is the OUI 74:5C:4B?: 74:5C:4B is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to GN Audio A/S. It covers every address from 74:5C:4B:00:00:00 to 74:5C:4B:FF:FF:FF, or 16,777,216 addresses in total. It is also written 74-5C-4B.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 74:5C:4B:00:00:00 that is 74:5C:4B — 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 GN Audio A/S located?: GN Audio A/S is listed at Lautrupbjerg 7 Ballerup DK DK-2750 in the IEEE OUI registry entry for 74:5C:4B. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does GN Audio A/S own?: GN Audio A/S holds 7 OUI prefixes in the IEEE registry, of which 74:5C:4B is one. A device made by GN Audio A/S could carry a MAC address from any of them.