Which company owns MAC address prefix D4:7F:78?

MAC address prefix D4:7F:78 is registered to Dopple B.V. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with D4:7F:78 has a network interface built by Dopple B.V..

What is the OUI D4:7F:78?

D4:7F:78 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Dopple B.V.. It covers every address from D4:7F:78:00:00:00 to D4:7F:78:FF:FF:FF, or 16,777,216 addresses in total. It is also written D4-7F-78.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in D4:7F:78:00:00:00 that is D4:7F:78 — 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 Dopple B.V. located?

Dopple B.V. is listed at Overcingellaan 7 Assen Drenthe NL 9401 LA in the IEEE OUI registry entry for D4:7F:78. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Dopple B.V.

MAC address prefix D4:7F:78 is registered to Dopple B.V. in the IEEE OUI registry. Any device whose MAC address begins with D4:7F:78 has a network interface built by Dopple B.V.. 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 D4:7F:78:00:00:00 to D4:7F:78:FF:FF:FF.

OUI prefix: D4:7F:78
Hyphen form: D4-7F-78
MAC range: D4:7F:78:00:00:00 – D4:7F:78:FF:FF:FF
Addresses in block: 16,777,216
Organization: Dopple B.V.
Address: Overcingellaan 7 Assen Drenthe NL 9401 LA
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.

2024-02-15Assigned to "Dopple B.V."
archived source →
2026-07-17Assigned to "Dopple B.V."

Nearby in the registry

The prefixes assigned immediately before and after D4:7F:78:

FAQ

Which company owns MAC address prefix D4:7F:78?: MAC address prefix D4:7F:78 is registered to Dopple B.V. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with D4:7F:78 has a network interface built by Dopple B.V..
What is the OUI D4:7F:78?: D4:7F:78 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Dopple B.V.. It covers every address from D4:7F:78:00:00:00 to D4:7F:78:FF:FF:FF, or 16,777,216 addresses in total. It is also written D4-7F-78.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in D4:7F:78:00:00:00 that is D4:7F:78 — 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 Dopple B.V. located?: Dopple B.V. is listed at Overcingellaan 7 Assen Drenthe NL 9401 LA in the IEEE OUI registry entry for D4:7F:78. This is the address the organization registered with the IEEE, which may differ from its current operating address.