Which company owns MAC address prefix E4:29:3D?

MAC address prefix E4:29:3D is registered to Shenzhen Sy-Fiber Optical Communication Technology.Co.,Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with E4:29:3D has a network interface built by Shenzhen Sy-Fiber Optical Communication Technology.Co.,Ltd.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in E4:29:3D:00:00:00 that is E4:29:3D — 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.

Shenzhen Sy-Fiber Optical Communication Technology.Co.,Ltd

MAC address prefix E4:29:3D is registered to Shenzhen Sy-Fiber Optical Communication Technology.Co.,Ltd in the IEEE OUI registry. Any device whose MAC address begins with E4:29:3D has a network interface built by Shenzhen Sy-Fiber Optical Communication 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 E4:29:3D:00:00:00 to E4:29:3D:FF:FF:FF.

OUI prefix: E4:29:3D
Hyphen form: E4-29-3D
MAC range: E4:29:3D:00:00:00 – E4:29:3D:FF:FF:FF
Addresses in block: 16,777,216
Organization: Shenzhen Sy-Fiber Optical Communication Technology.Co.,Ltd
Address: 11/F, Manjinghua Yingshuo Commercial Building, Songgang Street, Baoan District Shenzhen City Guangdong Provicne CN 518105
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 (1)

The IEEE registry publishes current state only — this is the change record we've kept since we started tracking it daily.

2026-07-17Assigned to "Shenzhen Sy-Fiber Optical Communication Technology.Co.,Ltd"

Nearby in the registry

The prefixes assigned immediately before and after E4:29:3D:

FAQ

Which company owns MAC address prefix E4:29:3D?: MAC address prefix E4:29:3D is registered to Shenzhen Sy-Fiber Optical Communication Technology.Co.,Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with E4:29:3D has a network interface built by Shenzhen Sy-Fiber Optical Communication Technology.Co.,Ltd.
What is the OUI E4:29:3D?: E4:29:3D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Shenzhen Sy-Fiber Optical Communication Technology.Co.,Ltd. It covers every address from E4:29:3D:00:00:00 to E4:29:3D:FF:FF:FF, or 16,777,216 addresses in total. It is also written E4-29-3D.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in E4:29:3D:00:00:00 that is E4:29:3D — 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 Shenzhen Sy-Fiber Optical Communication Technology.Co.,Ltd located?: Shenzhen Sy-Fiber Optical Communication Technology.Co.,Ltd is listed at 11/F, Manjinghua Yingshuo Commercial Building, Songgang Street, Baoan District Shenzhen City Guangdong Provicne CN 518105 in the IEEE OUI registry entry for E4:29:3D. This is the address the organization registered with the IEEE, which may differ from its current operating address.