Which company owns MAC address prefix D8:5D:EF?

MAC address prefix D8:5D:EF is registered to Busch-Jaeger Elektro GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with D8:5D:EF has a network interface built by Busch-Jaeger Elektro GmbH.

What is the OUI D8:5D:EF?

D8:5D:EF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Busch-Jaeger Elektro GmbH. It covers every address from D8:5D:EF:00:00:00 to D8:5D:EF:FF:FF:FF, or 16,777,216 addresses in total. It is also written D8-5D-EF.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in D8:5D:EF:00:00:00 that is D8:5D:EF — 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 Busch-Jaeger Elektro GmbH located?

Busch-Jaeger Elektro GmbH is listed at Freisenbergstrasse 2 Luedenscheid NRW DE 58513 in the IEEE OUI registry entry for D8:5D:EF. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Busch-Jaeger Elektro GmbH

MAC address prefix D8:5D:EF is registered to Busch-Jaeger Elektro GmbH in the IEEE OUI registry. Any device whose MAC address begins with D8:5D:EF has a network interface built by Busch-Jaeger Elektro GmbH. 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 D8:5D:EF:00:00:00 to D8:5D:EF:FF:FF:FF.

OUI prefix: D8:5D:EF
Hyphen form: D8-5D-EF
MAC range: D8:5D:EF:00:00:00 – D8:5D:EF:FF:FF:FF
Addresses in block: 16,777,216
Organization: Busch-Jaeger Elektro GmbH
Address: Freisenbergstrasse 2 Luedenscheid NRW DE 58513
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 "Busch-Jaeger Elektro GmbH"
archived source →
2026-07-17Assigned to "Busch-Jaeger Elektro GmbH"

Nearby in the registry

The prefixes assigned immediately before and after D8:5D:EF:

FAQ

Which company owns MAC address prefix D8:5D:EF?: MAC address prefix D8:5D:EF is registered to Busch-Jaeger Elektro GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with D8:5D:EF has a network interface built by Busch-Jaeger Elektro GmbH.
What is the OUI D8:5D:EF?: D8:5D:EF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Busch-Jaeger Elektro GmbH. It covers every address from D8:5D:EF:00:00:00 to D8:5D:EF:FF:FF:FF, or 16,777,216 addresses in total. It is also written D8-5D-EF.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in D8:5D:EF:00:00:00 that is D8:5D:EF — 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 Busch-Jaeger Elektro GmbH located?: Busch-Jaeger Elektro GmbH is listed at Freisenbergstrasse 2 Luedenscheid NRW DE 58513 in the IEEE OUI registry entry for D8:5D:EF. This is the address the organization registered with the IEEE, which may differ from its current operating address.