Which company owns MAC address prefix 80:3F:5D?

MAC address prefix 80:3F:5D is registered to Winstars Technology Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 80:3F:5D has a network interface built by Winstars Technology Ltd.

What is the OUI 80:3F:5D?

80:3F:5D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Winstars Technology Ltd. It covers every address from 80:3F:5D:00:00:00 to 80:3F:5D:FF:FF:FF, or 16,777,216 addresses in total. It is also written 80-3F-5D.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 80:3F:5D:00:00:00 that is 80:3F:5D — 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 Winstars Technology Ltd located?

Winstars Technology Ltd is listed at Block4,Taisong Industrial Park, DaLang Street, LongHua Town , Bao'an District Shenzhen Guangdong CN 518109 in the IEEE OUI registry entry for 80:3F:5D. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Winstars Technology Ltd

MAC address prefix 80:3F:5D is registered to Winstars Technology Ltd in the IEEE OUI registry. Any device whose MAC address begins with 80:3F:5D has a network interface built by Winstars Technology 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 80:3F:5D:00:00:00 to 80:3F:5D:FF:FF:FF.

OUI prefix: 80:3F:5D
Hyphen form: 80-3F-5D
MAC range: 80:3F:5D:00:00:00 – 80:3F:5D:FF:FF:FF
Addresses in block: 16,777,216
Organization: Winstars Technology Ltd
Address: Block4,Taisong Industrial Park, DaLang Street, LongHua Town , Bao'an District Shenzhen Guangdong CN 518109
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 "Winstars Technology Ltd"
archived source →
2026-07-17Assigned to "Winstars Technology Ltd"

Nearby in the registry

The prefixes assigned immediately before and after 80:3F:5D:

FAQ

Which company owns MAC address prefix 80:3F:5D?: MAC address prefix 80:3F:5D is registered to Winstars Technology Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 80:3F:5D has a network interface built by Winstars Technology Ltd.
What is the OUI 80:3F:5D?: 80:3F:5D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Winstars Technology Ltd. It covers every address from 80:3F:5D:00:00:00 to 80:3F:5D:FF:FF:FF, or 16,777,216 addresses in total. It is also written 80-3F-5D.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 80:3F:5D:00:00:00 that is 80:3F:5D — 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 Winstars Technology Ltd located?: Winstars Technology Ltd is listed at Block4,Taisong Industrial Park, DaLang Street, LongHua Town , Bao'an District Shenzhen Guangdong CN 518109 in the IEEE OUI registry entry for 80:3F:5D. This is the address the organization registered with the IEEE, which may differ from its current operating address.