Which company owns MAC address prefix AC:3C:B4?

MAC address prefix AC:3C:B4 is registered to Nilan A/S in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with AC:3C:B4 has a network interface built by Nilan A/S.

What is the OUI AC:3C:B4?

AC:3C:B4 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Nilan A/S. It covers every address from AC:3C:B4:00:00:00 to AC:3C:B4:FF:FF:FF, or 16,777,216 addresses in total. It is also written AC-3C-B4.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in AC:3C:B4:00:00:00 that is AC:3C:B4 — 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 Nilan A/S located?

Nilan A/S is listed at Nilanvej 2 Hedensted Vejle amt DK 8722 in the IEEE OUI registry entry for AC:3C:B4. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Nilan A/S

MAC address prefix AC:3C:B4 is registered to Nilan A/S in the IEEE OUI registry. Any device whose MAC address begins with AC:3C:B4 has a network interface built by Nilan 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 AC:3C:B4:00:00:00 to AC:3C:B4:FF:FF:FF.

OUI prefix: AC:3C:B4
Hyphen form: AC-3C-B4
MAC range: AC:3C:B4:00:00:00 – AC:3C:B4:FF:FF:FF
Addresses in block: 16,777,216
Organization: Nilan A/S
Address: Nilanvej 2 Hedensted Vejle amt DK 8722
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 "Nilan A/S"
archived source →
2026-07-17Assigned to "Nilan A/S"

Nearby in the registry

The prefixes assigned immediately before and after AC:3C:B4:

FAQ

Which company owns MAC address prefix AC:3C:B4?: MAC address prefix AC:3C:B4 is registered to Nilan A/S in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with AC:3C:B4 has a network interface built by Nilan A/S.
What is the OUI AC:3C:B4?: AC:3C:B4 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Nilan A/S. It covers every address from AC:3C:B4:00:00:00 to AC:3C:B4:FF:FF:FF, or 16,777,216 addresses in total. It is also written AC-3C-B4.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in AC:3C:B4:00:00:00 that is AC:3C:B4 — 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 Nilan A/S located?: Nilan A/S is listed at Nilanvej 2 Hedensted Vejle amt DK 8722 in the IEEE OUI registry entry for AC:3C:B4. This is the address the organization registered with the IEEE, which may differ from its current operating address.