Which company owns MAC address prefix D4:3D:39?

MAC address prefix D4:3D:39 is registered to Dialog Semiconductor in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with D4:3D:39 has a network interface built by Dialog Semiconductor.

What is the OUI D4:3D:39?

D4:3D:39 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Dialog Semiconductor. It covers every address from D4:3D:39:00:00:00 to D4:3D:39:FF:FF:FF, or 16,777,216 addresses in total. It is also written D4-3D-39.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in D4:3D:39:00:00:00 that is D4:3D:39 — 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 Dialog Semiconductor located?

Dialog Semiconductor is listed at B-7F, SiliconPark, 35, Pangyo-ro 255beon-gil, Bundang-gu Seongnam-si Gyeonggi-do KR 13486 in the IEEE OUI registry entry for D4:3D:39. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Dialog Semiconductor

MAC address prefix D4:3D:39 is registered to Dialog Semiconductor in the IEEE OUI registry. Any device whose MAC address begins with D4:3D:39 has a network interface built by Dialog Semiconductor. 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 D4:3D:39:00:00:00 to D4:3D:39:FF:FF:FF.

OUI prefix: D4:3D:39
Hyphen form: D4-3D-39
MAC range: D4:3D:39:00:00:00 – D4:3D:39:FF:FF:FF
Addresses in block: 16,777,216
Organization: Dialog Semiconductor
Address: B-7F, SiliconPark, 35, Pangyo-ro 255beon-gil, Bundang-gu Seongnam-si Gyeonggi-do KR 13486
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.

2018-12-21Assigned to "FCI. Inc"
archived source →
2019-07-04Renamed from "FCI. Inc" to "Dialog Semiconductor"
archived source →
2026-07-17Assigned to "Dialog Semiconductor"

Nearby in the registry

The prefixes assigned immediately before and after D4:3D:39:

FAQ

Which company owns MAC address prefix D4:3D:39?: MAC address prefix D4:3D:39 is registered to Dialog Semiconductor in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with D4:3D:39 has a network interface built by Dialog Semiconductor.
What is the OUI D4:3D:39?: D4:3D:39 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Dialog Semiconductor. It covers every address from D4:3D:39:00:00:00 to D4:3D:39:FF:FF:FF, or 16,777,216 addresses in total. It is also written D4-3D-39.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in D4:3D:39:00:00:00 that is D4:3D:39 — 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 Dialog Semiconductor located?: Dialog Semiconductor is listed at B-7F, SiliconPark, 35, Pangyo-ro 255beon-gil, Bundang-gu Seongnam-si Gyeonggi-do KR 13486 in the IEEE OUI registry entry for D4:3D:39. This is the address the organization registered with the IEEE, which may differ from its current operating address.