Which company owns MAC address prefix 9C:A3:A9?

MAC address prefix 9C:A3:A9 is registered to Guangzhou Juan Optical and Electronical Tech Joint Stock Co., Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 9C:A3:A9 has a network interface built by Guangzhou Juan Optical and Electronical Tech Joint Stock Co., Ltd.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 9C:A3:A9:00:00:00 that is 9C:A3:A9 — 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.

Guangzhou Juan Optical and Electronical Tech Joint Stock Co., Ltd

MAC address prefix 9C:A3:A9 is registered to Guangzhou Juan Optical and Electronical Tech Joint Stock Co., Ltd in the IEEE OUI registry. Any device whose MAC address begins with 9C:A3:A9 has a network interface built by Guangzhou Juan Optical and Electronical Tech Joint Stock 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 9C:A3:A9:00:00:00 to 9C:A3:A9:FF:FF:FF.

OUI prefix: 9C:A3:A9
Hyphen form: 9C-A3-A9
MAC range: 9C:A3:A9:00:00:00 – 9C:A3:A9:FF:FF:FF
Addresses in block: 16,777,216
Organization: Guangzhou Juan Optical and Electronical Tech Joint Stock Co., Ltd
Address: NO.9, street 3, HengLing industrial zone, Tangdong, tianhe district Guangzhou Guangdong CN 510000
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 "Guangzhou Juan Optical and Electronical Tech Joint Stock Co., Ltd"
archived source →
2026-07-17Assigned to "Guangzhou Juan Optical and Electronical Tech Joint Stock Co., Ltd"

Nearby in the registry

The prefixes assigned immediately before and after 9C:A3:A9:

FAQ

Which company owns MAC address prefix 9C:A3:A9?: MAC address prefix 9C:A3:A9 is registered to Guangzhou Juan Optical and Electronical Tech Joint Stock Co., Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 9C:A3:A9 has a network interface built by Guangzhou Juan Optical and Electronical Tech Joint Stock Co., Ltd.
What is the OUI 9C:A3:A9?: 9C:A3:A9 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Guangzhou Juan Optical and Electronical Tech Joint Stock Co., Ltd. It covers every address from 9C:A3:A9:00:00:00 to 9C:A3:A9:FF:FF:FF, or 16,777,216 addresses in total. It is also written 9C-A3-A9.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 9C:A3:A9:00:00:00 that is 9C:A3:A9 — 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 Guangzhou Juan Optical and Electronical Tech Joint Stock Co., Ltd located?: Guangzhou Juan Optical and Electronical Tech Joint Stock Co., Ltd is listed at NO.9, street 3, HengLing industrial zone, Tangdong, tianhe district Guangzhou Guangdong CN 510000 in the IEEE OUI registry entry for 9C:A3:A9. This is the address the organization registered with the IEEE, which may differ from its current operating address.