Which company owns MAC address prefix 04:57:91?

MAC address prefix 04:57:91 is registered to Shenzhenshi Xinzhongxin Technology Co.Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 04:57:91 has a network interface built by Shenzhenshi Xinzhongxin Technology Co.Ltd.

What is the OUI 04:57:91?

04:57:91 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Shenzhenshi Xinzhongxin Technology Co.Ltd. It covers every address from 04:57:91:00:00:00 to 04:57:91:FF:FF:FF, or 16,777,216 addresses in total. It is also written 04-57-91.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 04:57:91:00:00:00 that is 04:57:91 — 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 Shenzhenshi Xinzhongxin Technology Co.Ltd located?

Shenzhenshi Xinzhongxin Technology Co.Ltd is listed at Block 3, Dong Huan Industrial Park, Sha Jing Town, Bao’an District, Shenzhen City, Guangdong Province, China ShenZHEN GuangDong CN 518104 in the IEEE OUI registry entry for 04:57:91. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does Shenzhenshi Xinzhongxin Technology Co.Ltd own?

Shenzhenshi Xinzhongxin Technology Co.Ltd holds 5 OUI prefixes in the IEEE registry, of which 04:57:91 is one. A device made by Shenzhenshi Xinzhongxin Technology Co.Ltd could carry a MAC address from any of them.

Shenzhenshi Xinzhongxin Technology Co.Ltd

MAC address prefix 04:57:91 is registered to Shenzhenshi Xinzhongxin Technology Co.Ltd in the IEEE OUI registry. Any device whose MAC address begins with 04:57:91 has a network interface built by Shenzhenshi Xinzhongxin 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 04:57:91:00:00:00 to 04:57:91:FF:FF:FF.

OUI prefix: 04:57:91
Hyphen form: 04-57-91
MAC range: 04:57:91:00:00:00 – 04:57:91:FF:FF:FF
Addresses in block: 16,777,216
Organization: Shenzhenshi Xinzhongxin Technology Co.Ltd
Address: Block 3, Dong Huan Industrial Park, Sha Jing Town, Bao’an District, Shenzhen City, Guangdong Province, China ShenZHEN GuangDong CN 518104
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 Shenzhenshi Xinzhongxin Technology Co.Ltd

Shenzhenshi Xinzhongxin Technology Co.Ltd holds 5 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.

2023-07-11Assigned to "Shenzhenshi Xinzhongxin Technology Co.Ltd"
archived source →
2026-07-17Assigned to "Shenzhenshi Xinzhongxin Technology Co.Ltd"

Nearby in the registry

The prefixes assigned immediately before and after 04:57:91:

FAQ

Which company owns MAC address prefix 04:57:91?: MAC address prefix 04:57:91 is registered to Shenzhenshi Xinzhongxin Technology Co.Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 04:57:91 has a network interface built by Shenzhenshi Xinzhongxin Technology Co.Ltd.
What is the OUI 04:57:91?: 04:57:91 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Shenzhenshi Xinzhongxin Technology Co.Ltd. It covers every address from 04:57:91:00:00:00 to 04:57:91:FF:FF:FF, or 16,777,216 addresses in total. It is also written 04-57-91.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 04:57:91:00:00:00 that is 04:57:91 — 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 Shenzhenshi Xinzhongxin Technology Co.Ltd located?: Shenzhenshi Xinzhongxin Technology Co.Ltd is listed at Block 3, Dong Huan Industrial Park, Sha Jing Town, Bao’an District, Shenzhen City, Guangdong Province, China ShenZHEN GuangDong CN 518104 in the IEEE OUI registry entry for 04:57:91. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does Shenzhenshi Xinzhongxin Technology Co.Ltd own?: Shenzhenshi Xinzhongxin Technology Co.Ltd holds 5 OUI prefixes in the IEEE registry, of which 04:57:91 is one. A device made by Shenzhenshi Xinzhongxin Technology Co.Ltd could carry a MAC address from any of them.