Which company owns MAC address prefix 84:D4:C8?

MAC address prefix 84:D4:C8 is registered to Widex A/S in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 84:D4:C8 has a network interface built by Widex A/S.

What is the OUI 84:D4:C8?

84:D4:C8 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Widex A/S. It covers every address from 84:D4:C8:00:00:00 to 84:D4:C8:FF:FF:FF, or 16,777,216 addresses in total. It is also written 84-D4-C8.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 84:D4:C8:00:00:00 that is 84:D4:C8 — 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 Widex A/S located?

Widex A/S is listed at Nymoellevej 6 Lynge Alleroed DK DK3540 in the IEEE OUI registry entry for 84:D4:C8. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does Widex A/S own?

Widex A/S holds 2 OUI prefixes in the IEEE registry, of which 84:D4:C8 is one. A device made by Widex A/S could carry a MAC address from any of them.

Widex A/S

MAC address prefix 84:D4:C8 is registered to Widex A/S in the IEEE OUI registry. Any device whose MAC address begins with 84:D4:C8 has a network interface built by Widex 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 84:D4:C8:00:00:00 to 84:D4:C8:FF:FF:FF.

OUI prefix: 84:D4:C8
Hyphen form: 84-D4-C8
MAC range: 84:D4:C8:00:00:00 – 84:D4:C8:FF:FF:FF
Addresses in block: 16,777,216
Organization: Widex A/S
Address: Nymoellevej 6 Lynge Alleroed DK DK3540
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 Widex A/S

Widex A/S holds 2 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

40:4A:D4

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 "Widex A/S"
archived source →
2026-07-17Assigned to "Widex A/S"

Nearby in the registry

The prefixes assigned immediately before and after 84:D4:C8:

FAQ

Which company owns MAC address prefix 84:D4:C8?: MAC address prefix 84:D4:C8 is registered to Widex A/S in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 84:D4:C8 has a network interface built by Widex A/S.
What is the OUI 84:D4:C8?: 84:D4:C8 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Widex A/S. It covers every address from 84:D4:C8:00:00:00 to 84:D4:C8:FF:FF:FF, or 16,777,216 addresses in total. It is also written 84-D4-C8.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 84:D4:C8:00:00:00 that is 84:D4:C8 — 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 Widex A/S located?: Widex A/S is listed at Nymoellevej 6 Lynge Alleroed DK DK3540 in the IEEE OUI registry entry for 84:D4:C8. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does Widex A/S own?: Widex A/S holds 2 OUI prefixes in the IEEE registry, of which 84:D4:C8 is one. A device made by Widex A/S could carry a MAC address from any of them.