Which company owns MAC address prefix B4:61:FF?

MAC address prefix B4:61:FF is registered to Lumigon A/S in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B4:61:FF has a network interface built by Lumigon A/S.

What is the OUI B4:61:FF?

B4:61:FF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Lumigon A/S. It covers every address from B4:61:FF:00:00:00 to B4:61:FF:FF:FF:FF, or 16,777,216 addresses in total. It is also written B4-61-FF.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in B4:61:FF:00:00:00 that is B4:61:FF — 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 Lumigon A/S located?

Lumigon A/S is listed at Baadehavnsgade 2A Copenhagen SV Denmark DK 2450 in the IEEE OUI registry entry for B4:61:FF. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Lumigon A/S

MAC address prefix B4:61:FF is registered to Lumigon A/S in the IEEE OUI registry. Any device whose MAC address begins with B4:61:FF has a network interface built by Lumigon 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 B4:61:FF:00:00:00 to B4:61:FF:FF:FF:FF.

OUI prefix: B4:61:FF
Hyphen form: B4-61-FF
MAC range: B4:61:FF:00:00:00 – B4:61:FF:FF:FF:FF
Addresses in block: 16,777,216
Organization: Lumigon A/S
Address: Baadehavnsgade 2A Copenhagen SV Denmark DK 2450
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 "Lumigon A/S"
archived source →
2026-07-17Assigned to "Lumigon A/S"

Nearby in the registry

The prefixes assigned immediately before and after B4:61:FF:

FAQ

Which company owns MAC address prefix B4:61:FF?: MAC address prefix B4:61:FF is registered to Lumigon A/S in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B4:61:FF has a network interface built by Lumigon A/S.
What is the OUI B4:61:FF?: B4:61:FF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Lumigon A/S. It covers every address from B4:61:FF:00:00:00 to B4:61:FF:FF:FF:FF, or 16,777,216 addresses in total. It is also written B4-61-FF.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in B4:61:FF:00:00:00 that is B4:61:FF — 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 Lumigon A/S located?: Lumigon A/S is listed at Baadehavnsgade 2A Copenhagen SV Denmark DK 2450 in the IEEE OUI registry entry for B4:61:FF. This is the address the organization registered with the IEEE, which may differ from its current operating address.