Which company owns MAC address prefix 04:26:05?

MAC address prefix 04:26:05 is registered to Bosch Building Automation GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 04:26:05 has a network interface built by Bosch Building Automation GmbH.

What is the OUI 04:26:05?

04:26:05 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Bosch Building Automation GmbH. It covers every address from 04:26:05:00:00:00 to 04:26:05:FF:FF:FF, or 16,777,216 addresses in total. It is also written 04-26-05.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 04:26:05:00:00:00 that is 04:26:05 — 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 Bosch Building Automation GmbH located?

Bosch Building Automation GmbH is listed at Kapellenweg 42 Verl DE 33415 in the IEEE OUI registry entry for 04:26:05. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Bosch Building Automation GmbH

MAC address prefix 04:26:05 is registered to Bosch Building Automation GmbH in the IEEE OUI registry. Any device whose MAC address begins with 04:26:05 has a network interface built by Bosch Building Automation 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 04:26:05:00:00:00 to 04:26:05:FF:FF:FF.

OUI prefix: 04:26:05
Hyphen form: 04-26-05
MAC range: 04:26:05:00:00:00 – 04:26:05:FF:FF:FF
Addresses in block: 16,777,216
Organization: Bosch Building Automation GmbH
Address: Kapellenweg 42 Verl DE 33415
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 "GFR Gesellschaft für Regelungstechnik und Energieeinsparung mbH"
archived source →
2022-07-11Renamed from "GFR Gesellschaft für Regelungstechnik und Energieeinsparung mbH" to "Bosch Building Automation GmbH"
archived source →
2026-07-17Assigned to "Bosch Building Automation GmbH"

Nearby in the registry

The prefixes assigned immediately before and after 04:26:05:

FAQ

Which company owns MAC address prefix 04:26:05?: MAC address prefix 04:26:05 is registered to Bosch Building Automation GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 04:26:05 has a network interface built by Bosch Building Automation GmbH.
What is the OUI 04:26:05?: 04:26:05 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Bosch Building Automation GmbH. It covers every address from 04:26:05:00:00:00 to 04:26:05:FF:FF:FF, or 16,777,216 addresses in total. It is also written 04-26-05.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 04:26:05:00:00:00 that is 04:26:05 — 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 Bosch Building Automation GmbH located?: Bosch Building Automation GmbH is listed at Kapellenweg 42 Verl DE 33415 in the IEEE OUI registry entry for 04:26:05. This is the address the organization registered with the IEEE, which may differ from its current operating address.