Qingdao HaierTechnology Co.,Ltd
MAC address prefix 04:C9:DE is registered to Qingdao HaierTechnology Co.,Ltd in the IEEE OUI registry. Any device whose MAC address begins with 04:C9:DE has a network interface built by Qingdao HaierTechnology Co.,Ltd. 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:C9:DE:00:00:00 to 04:C9:DE:FF:FF:FF.
- OUI prefix
- 04:C9:DE
- Hyphen form
- 04-C9-DE
- MAC range
- 04:C9:DE:00:00:00 – 04:C9:DE:FF:FF:FF
- Addresses in block
- 16,777,216
- Organization
- Qingdao HaierTechnology Co.,Ltd
- Address
- Building C01,Haier Information Park,No.1 Haier Road Qingdao CN 266101
- 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 Qingdao HaierTechnology Co.,Ltd
Qingdao HaierTechnology Co.,Ltd holds 3 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:
Assignment history (2)
The IEEE registry publishes current state only — this is the change record we've kept since we started tracking it daily.
- 2026-01-08Assigned to "Qingdao HaierTechnology Co.,Ltd"archived source →
- 2026-07-17Assigned to "Qingdao HaierTechnology Co.,Ltd"
Nearby in the registry
The prefixes assigned immediately before and after 04:C9:DE:
- TP-Link Systems Inc.04:C8:45
- Samtec Inc04:C8:80
- Google, Inc.04:C8:B0
- IEEE Registration Authority04:C9:8B
- Phistek INC.04:C9:91
- Dish Technologies Corp04:C9:D9
- Enfabrica04:CA:8D
- HUAWEI TECHNOLOGIES CO.,LTD04:CA:ED
- Samsung Electronics Co.,Ltd04:CB:01
- Traka plc04:CB:1D
- Shenzhen Jingxun Software Telecommunication Technology Co.,Ltd04:CB:88
- HUAWEI TECHNOLOGIES CO.,LTD04:CC:BC
FAQ
- Which company owns MAC address prefix 04:C9:DE?
- MAC address prefix 04:C9:DE is registered to Qingdao HaierTechnology Co.,Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 04:C9:DE has a network interface built by Qingdao HaierTechnology Co.,Ltd.
- What is the OUI 04:C9:DE?
- 04:C9:DE is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Qingdao HaierTechnology Co.,Ltd. It covers every address from 04:C9:DE:00:00:00 to 04:C9:DE:FF:FF:FF, or 16,777,216 addresses in total. It is also written 04-C9-DE.
- How do I find the manufacturer of a MAC address?
- Take the first three octets of the address — in 04:C9:DE:00:00:00 that is 04:C9:DE — 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 Qingdao HaierTechnology Co.,Ltd located?
- Qingdao HaierTechnology Co.,Ltd is listed at Building C01,Haier Information Park,No.1 Haier Road Qingdao CN 266101 in the IEEE OUI registry entry for 04:C9:DE. This is the address the organization registered with the IEEE, which may differ from its current operating address.
- How many MAC prefixes does Qingdao HaierTechnology Co.,Ltd own?
- Qingdao HaierTechnology Co.,Ltd holds 3 OUI prefixes in the IEEE registry, of which 04:C9:DE is one. A device made by Qingdao HaierTechnology Co.,Ltd could carry a MAC address from any of them.