Alfred Kaercher GmbH & Co KG
MAC address prefix A4:09:CB is registered to Alfred Kaercher GmbH & Co KG in the IEEE OUI registry. Any device whose MAC address begins with A4:09:CB has a network interface built by Alfred Kaercher 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 A4:09:CB:00:00:00 to A4:09:CB:FF:FF:FF.
- OUI prefix
- A4:09:CB
- Hyphen form
- A4-09-CB
- MAC range
- A4:09:CB:00:00:00 – A4:09:CB:FF:FF:FF
- Addresses in block
- 16,777,216
- Organization
- Alfred Kaercher GmbH & Co KG
- Address
- Alfred Kaercher Gmbh & Co KG Winnenden Baden-Wuerttemberg DE 71364
- 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 "Alfred Kaercher GmbH & Co KG"archived source →
- 2026-07-17Assigned to "Alfred Kaercher GmbH & Co KG"
Nearby in the registry
The prefixes assigned immediately before and after A4:09:CB:
- Amazon Technologies Inc.A4:08:01
- Nokia Solutions and Networks India Private LimitedA4:08:53
- Murata Manufacturing Co., Ltd.A4:08:EA
- Sagemcom Broadband SASA4:08:F5
- Apple, Inc.A4:09:87
- HUAWEI TECHNOLOGIES CO.,LTDA4:09:B3
- FAST PHOTONICS HK CO., LIMITEDA4:0B:78
- Carry Technology Co.,LtdA4:0B:ED
- Shenzhen Colorful Yugong Technology and Development Co., Ltd.A4:0C:66
- Cisco Systems, IncA4:0C:C3
- Xiamen Intretech Inc.A4:0D:BC
- Facebook IncA4:0E:2B
FAQ
- Which company owns MAC address prefix A4:09:CB?
- MAC address prefix A4:09:CB is registered to Alfred Kaercher GmbH & Co KG in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with A4:09:CB has a network interface built by Alfred Kaercher GmbH & Co KG.
- What is the OUI A4:09:CB?
- A4:09:CB is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Alfred Kaercher GmbH & Co KG. It covers every address from A4:09:CB:00:00:00 to A4:09:CB:FF:FF:FF, or 16,777,216 addresses in total. It is also written A4-09-CB.
- How do I find the manufacturer of a MAC address?
- Take the first three octets of the address — in A4:09:CB:00:00:00 that is A4:09:CB — 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 Alfred Kaercher GmbH & Co KG located?
- Alfred Kaercher GmbH & Co KG is listed at Alfred Kaercher Gmbh & Co KG Winnenden Baden-Wuerttemberg DE 71364 in the IEEE OUI registry entry for A4:09:CB. This is the address the organization registered with the IEEE, which may differ from its current operating address.