Baidu Online Network Technology (Beijing) Co., Ltd
MAC address prefix 10:A4:B9 is registered to Baidu Online Network Technology (Beijing) Co., Ltd in the IEEE OUI registry. Any device whose MAC address begins with 10:A4:B9 has a network interface built by Baidu Online Network Technology (Beijing) 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 10:A4:B9:00:00:00 to 10:A4:B9:FF:FF:FF.
- OUI prefix
- 10:A4:B9
- Hyphen form
- 10-A4-B9
- MAC range
- 10:A4:B9:00:00:00 – 10:A4:B9:FF:FF:FF
- Addresses in block
- 16,777,216
- Organization
- Baidu Online Network Technology (Beijing) Co., Ltd
- Address
- Baidu Campus, No.10 Shangdi 10th Street, Haidian District Beijing CN 100085
- 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 Baidu Online Network Technology (Beijing) Co., Ltd
Baidu Online Network Technology (Beijing) Co., Ltd holds 5 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.
- 2018-12-21Assigned to "Baidu Online Network Technology (Beijing) Co., Ltd"archived source →
- 2026-07-17Assigned to "Baidu Online Network Technology (Beijing) Co., Ltd"
Nearby in the registry
The prefixes assigned immediately before and after 10:A4:B9:
- Apple, Inc.10:A1:DA
- GOLD3LINK ELECTRONICS CO., LTD10:A2:4E
- Apple, Inc.10:A2:D3
- HUAWEI TECHNOLOGIES CO.,LTD10:A3:0F
- Iskratel d.o.o.10:A3:B8
- Kwikset10:A4:50
- SHENZHEN BILIAN ELECTRONIC CO.，LTD10:A4:BE
- Apple, Inc.10:A4:C9
- HUAWEI TECHNOLOGIES CO.,LTD10:A4:DA
- Intel Corporate10:A5:1D
- Iton Technology Corp.10:A5:62
- Murata Manufacturing Co., Ltd.10:A5:D0
FAQ
- Which company owns MAC address prefix 10:A4:B9?
- MAC address prefix 10:A4:B9 is registered to Baidu Online Network Technology (Beijing) Co., Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 10:A4:B9 has a network interface built by Baidu Online Network Technology (Beijing) Co., Ltd.
- What is the OUI 10:A4:B9?
- 10:A4:B9 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Baidu Online Network Technology (Beijing) Co., Ltd. It covers every address from 10:A4:B9:00:00:00 to 10:A4:B9:FF:FF:FF, or 16,777,216 addresses in total. It is also written 10-A4-B9.
- How do I find the manufacturer of a MAC address?
- Take the first three octets of the address — in 10:A4:B9:00:00:00 that is 10:A4:B9 — 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 Baidu Online Network Technology (Beijing) Co., Ltd located?
- Baidu Online Network Technology (Beijing) Co., Ltd is listed at Baidu Campus, No.10 Shangdi 10th Street, Haidian District Beijing CN 100085 in the IEEE OUI registry entry for 10:A4:B9. This is the address the organization registered with the IEEE, which may differ from its current operating address.
- How many MAC prefixes does Baidu Online Network Technology (Beijing) Co., Ltd own?
- Baidu Online Network Technology (Beijing) Co., Ltd holds 5 OUI prefixes in the IEEE registry, of which 10:A4:B9 is one. A device made by Baidu Online Network Technology (Beijing) Co., Ltd could carry a MAC address from any of them.