Which company owns MAC address prefix B4:C9:B9?

MAC address prefix B4:C9:B9 is registered to Sichuan AI-Link Technology Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B4:C9:B9 has a network interface built by Sichuan AI-Link Technology Co., Ltd..

What is the OUI B4:C9:B9?

B4:C9:B9 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Sichuan AI-Link Technology Co., Ltd.. It covers every address from B4:C9:B9:00:00:00 to B4:C9:B9:FF:FF:FF, or 16,777,216 addresses in total. It is also written B4-C9-B9.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in B4:C9:B9:00:00:00 that is B4:C9: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 Sichuan AI-Link Technology Co., Ltd. located?

Sichuan AI-Link Technology Co., Ltd. is listed at Anzhou, Industrial Park Mianyang Sichuan CN 622650 in the IEEE OUI registry entry for B4:C9:B9. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does Sichuan AI-Link Technology Co., Ltd. own?

Sichuan AI-Link Technology Co., Ltd. holds 29 OUI prefixes in the IEEE registry, of which B4:C9:B9 is one. A device made by Sichuan AI-Link Technology Co., Ltd. could carry a MAC address from any of them.

Sichuan AI-Link Technology Co., Ltd.

MAC address prefix B4:C9:B9 is registered to Sichuan AI-Link Technology Co., Ltd. in the IEEE OUI registry. Any device whose MAC address begins with B4:C9:B9 has a network interface built by Sichuan AI-Link Technology 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 B4:C9:B9:00:00:00 to B4:C9:B9:FF:FF:FF.

OUI prefix: B4:C9:B9
Hyphen form: B4-C9-B9
MAC range: B4:C9:B9:00:00:00 – B4:C9:B9:FF:FF:FF
Addresses in block: 16,777,216
Organization: Sichuan AI-Link Technology Co., Ltd.
Address: Anzhou, Industrial Park Mianyang Sichuan CN 622650
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 Sichuan AI-Link Technology Co., Ltd.

Sichuan AI-Link Technology Co., Ltd. holds 29 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.

2020-03-21Assigned to "Sichuan AI-Link Technology Co., Ltd."
archived source →
2026-07-17Assigned to "Sichuan AI-Link Technology Co., Ltd."

Nearby in the registry

The prefixes assigned immediately before and after B4:C9:B9:

FAQ

Which company owns MAC address prefix B4:C9:B9?: MAC address prefix B4:C9:B9 is registered to Sichuan AI-Link Technology Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B4:C9:B9 has a network interface built by Sichuan AI-Link Technology Co., Ltd..
What is the OUI B4:C9:B9?: B4:C9:B9 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Sichuan AI-Link Technology Co., Ltd.. It covers every address from B4:C9:B9:00:00:00 to B4:C9:B9:FF:FF:FF, or 16,777,216 addresses in total. It is also written B4-C9-B9.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in B4:C9:B9:00:00:00 that is B4:C9: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 Sichuan AI-Link Technology Co., Ltd. located?: Sichuan AI-Link Technology Co., Ltd. is listed at Anzhou, Industrial Park Mianyang Sichuan CN 622650 in the IEEE OUI registry entry for B4:C9:B9. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does Sichuan AI-Link Technology Co., Ltd. own?: Sichuan AI-Link Technology Co., Ltd. holds 29 OUI prefixes in the IEEE registry, of which B4:C9:B9 is one. A device made by Sichuan AI-Link Technology Co., Ltd. could carry a MAC address from any of them.