Which company owns MAC address prefix D4:90:E0?

MAC address prefix D4:90:E0 is registered to Wachendorff Automation GmbH & CO.KG in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with D4:90:E0 has a network interface built by Wachendorff Automation GmbH & CO.KG.

What is the OUI D4:90:E0?

D4:90:E0 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Wachendorff Automation GmbH & CO.KG. It covers every address from D4:90:E0:00:00:00 to D4:90:E0:FF:FF:FF, or 16,777,216 addresses in total. It is also written D4-90-E0.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in D4:90:E0:00:00:00 that is D4:90:E0 — 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 Wachendorff Automation GmbH & CO.KG located?

Wachendorff Automation GmbH & CO.KG is listed at Industriestraße 7 Geisenheim DE 65366 in the IEEE OUI registry entry for D4:90:E0. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does Wachendorff Automation GmbH & CO.KG own?

Wachendorff Automation GmbH & CO.KG holds 2 OUI prefixes in the IEEE registry, of which D4:90:E0 is one. A device made by Wachendorff Automation GmbH & CO.KG could carry a MAC address from any of them.

Wachendorff Automation GmbH & CO.KG

MAC address prefix D4:90:E0 is registered to Wachendorff Automation GmbH & CO.KG in the IEEE OUI registry. Any device whose MAC address begins with D4:90:E0 has a network interface built by Wachendorff Automation GmbH & CO.KG. 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 D4:90:E0:00:00:00 to D4:90:E0:FF:FF:FF.

OUI prefix: D4:90:E0
Hyphen form: D4-90-E0
MAC range: D4:90:E0:00:00:00 – D4:90:E0:FF:FF:FF
Addresses in block: 16,777,216
Organization: Wachendorff Automation GmbH & CO.KG
Address: Industriestraße 7 Geisenheim DE 65366
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 Wachendorff Automation GmbH & CO.KG

Wachendorff Automation GmbH & CO.KG holds 2 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

A8:D3:C8

Assignment history (3)

The IEEE registry publishes current state only — this is the change record we've kept since we started tracking it daily.

2017-09-08Assigned to "Topcon Electronics GmbH & Co. KG"
archived source →
2025-02-27Renamed from "Topcon Electronics GmbH & Co. KG" to "Wachendorff Automation GmbH & CO.KG"
archived source →
2026-07-17Assigned to "Wachendorff Automation GmbH & CO.KG"

Nearby in the registry

The prefixes assigned immediately before and after D4:90:E0:

FAQ

Which company owns MAC address prefix D4:90:E0?: MAC address prefix D4:90:E0 is registered to Wachendorff Automation GmbH & CO.KG in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with D4:90:E0 has a network interface built by Wachendorff Automation GmbH & CO.KG.
What is the OUI D4:90:E0?: D4:90:E0 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Wachendorff Automation GmbH & CO.KG. It covers every address from D4:90:E0:00:00:00 to D4:90:E0:FF:FF:FF, or 16,777,216 addresses in total. It is also written D4-90-E0.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in D4:90:E0:00:00:00 that is D4:90:E0 — 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 Wachendorff Automation GmbH & CO.KG located?: Wachendorff Automation GmbH & CO.KG is listed at Industriestraße 7 Geisenheim DE 65366 in the IEEE OUI registry entry for D4:90:E0. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does Wachendorff Automation GmbH & CO.KG own?: Wachendorff Automation GmbH & CO.KG holds 2 OUI prefixes in the IEEE registry, of which D4:90:E0 is one. A device made by Wachendorff Automation GmbH & CO.KG could carry a MAC address from any of them.