Which company owns MAC address prefix 00:1F:23?

MAC address prefix 00:1F:23 is registered to DGS Diagnostics A/S in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 00:1F:23 has a network interface built by DGS Diagnostics A/S.

What is the OUI 00:1F:23?

00:1F:23 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to DGS Diagnostics A/S. It covers every address from 00:1F:23:00:00:00 to 00:1F:23:FF:FF:FF, or 16,777,216 addresses in total. It is also written 00-1F-23.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 00:1F:23:00:00:00 that is 00:1F:23 — 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 DGS Diagnostics A/S located?

DGS Diagnostics A/S is listed at Audiometer Allé 1 Middelfart DK DK 5500 in the IEEE OUI registry entry for 00:1F:23. This is the address the organization registered with the IEEE, which may differ from its current operating address.

DGS Diagnostics A/S

MAC address prefix 00:1F:23 is registered to DGS Diagnostics A/S in the IEEE OUI registry. Any device whose MAC address begins with 00:1F:23 has a network interface built by DGS Diagnostics 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 00:1F:23:00:00:00 to 00:1F:23:FF:FF:FF.

OUI prefix: 00:1F:23
Hyphen form: 00-1F-23
MAC range: 00:1F:23:00:00:00 – 00:1F:23:FF:FF:FF
Addresses in block: 16,777,216
Organization: DGS Diagnostics A/S
Address: Audiometer Allé 1 Middelfart DK DK 5500
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 (3)

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 "Interacoustics"
archived source →
2025-05-13Renamed from "Interacoustics" to "DGS Diagnostics A/S"
archived source →
2026-07-17Assigned to "DGS Diagnostics A/S"

Nearby in the registry

The prefixes assigned immediately before and after 00:1F:23:

FAQ

Which company owns MAC address prefix 00:1F:23?: MAC address prefix 00:1F:23 is registered to DGS Diagnostics A/S in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 00:1F:23 has a network interface built by DGS Diagnostics A/S.
What is the OUI 00:1F:23?: 00:1F:23 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to DGS Diagnostics A/S. It covers every address from 00:1F:23:00:00:00 to 00:1F:23:FF:FF:FF, or 16,777,216 addresses in total. It is also written 00-1F-23.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 00:1F:23:00:00:00 that is 00:1F:23 — 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 DGS Diagnostics A/S located?: DGS Diagnostics A/S is listed at Audiometer Allé 1 Middelfart DK DK 5500 in the IEEE OUI registry entry for 00:1F:23. This is the address the organization registered with the IEEE, which may differ from its current operating address.