Which company owns MAC address prefix 20:74:CF?

MAC address prefix 20:74:CF is registered to Shenzhen Voxtech Co.,Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 20:74:CF has a network interface built by Shenzhen Voxtech Co.,Ltd.

What is the OUI 20:74:CF?

20:74:CF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Shenzhen Voxtech Co.,Ltd. It covers every address from 20:74:CF:00:00:00 to 20:74:CF:FF:FF:FF, or 16,777,216 addresses in total. It is also written 20-74-CF.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 20:74:CF:00:00:00 that is 20:74:CF — 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 Voxtech Co.,Ltd located?

Shenzhen Voxtech Co.,Ltd is listed at 4/F East, Building 4, Minqi Science&Technology Park, Pingshan, Shenzhen Guangdong CN 518055 in the IEEE OUI registry entry for 20:74:CF. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Shenzhen Voxtech Co.,Ltd

MAC address prefix 20:74:CF is registered to Shenzhen Voxtech Co.,Ltd in the IEEE OUI registry. Any device whose MAC address begins with 20:74:CF has a network interface built by Shenzhen Voxtech 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 20:74:CF:00:00:00 to 20:74:CF:FF:FF:FF.

OUI prefix: 20:74:CF
Hyphen form: 20-74-CF
MAC range: 20:74:CF:00:00:00 – 20:74:CF:FF:FF:FF
Addresses in block: 16,777,216
Organization: Shenzhen Voxtech Co.,Ltd
Address: 4/F East, Building 4, Minqi Science&Technology Park, Pingshan, Shenzhen Guangdong CN 518055
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 "Shenzhen Voxtech Co.,Ltd"
archived source →
2026-07-17Assigned to "Shenzhen Voxtech Co.,Ltd"

Nearby in the registry

The prefixes assigned immediately before and after 20:74:CF:

FAQ

Which company owns MAC address prefix 20:74:CF?: MAC address prefix 20:74:CF is registered to Shenzhen Voxtech Co.,Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 20:74:CF has a network interface built by Shenzhen Voxtech Co.,Ltd.
What is the OUI 20:74:CF?: 20:74:CF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Shenzhen Voxtech Co.,Ltd. It covers every address from 20:74:CF:00:00:00 to 20:74:CF:FF:FF:FF, or 16,777,216 addresses in total. It is also written 20-74-CF.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 20:74:CF:00:00:00 that is 20:74:CF — 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 Voxtech Co.,Ltd located?: Shenzhen Voxtech Co.,Ltd is listed at 4/F East, Building 4, Minqi Science&Technology Park, Pingshan, Shenzhen Guangdong CN 518055 in the IEEE OUI registry entry for 20:74:CF. This is the address the organization registered with the IEEE, which may differ from its current operating address.