Which company owns MAC address prefix 84:1B:38?

MAC address prefix 84:1B:38 is registered to Shenzhen Excelsecu Data Technology Co.,Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 84:1B:38 has a network interface built by Shenzhen Excelsecu Data Technology Co.,Ltd.

What is the OUI 84:1B:38?

84:1B:38 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Shenzhen Excelsecu Data Technology Co.,Ltd. It covers every address from 84:1B:38:00:00:00 to 84:1B:38:FF:FF:FF, or 16,777,216 addresses in total. It is also written 84-1B-38.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 84:1B:38:00:00:00 that is 84:1B:38 — 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 Excelsecu Data Technology Co.,Ltd located?

Shenzhen Excelsecu Data Technology Co.,Ltd is listed at Unit 701-709,7/F，South Block,SDGI Building A, No.2, Shenzhen Guangdong CN 518057 in the IEEE OUI registry entry for 84:1B:38. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does Shenzhen Excelsecu Data Technology Co.,Ltd own?

Shenzhen Excelsecu Data Technology Co.,Ltd holds 2 OUI prefixes in the IEEE registry, of which 84:1B:38 is one. A device made by Shenzhen Excelsecu Data Technology Co.,Ltd could carry a MAC address from any of them.

Shenzhen Excelsecu Data Technology Co.,Ltd

MAC address prefix 84:1B:38 is registered to Shenzhen Excelsecu Data Technology Co.,Ltd in the IEEE OUI registry. Any device whose MAC address begins with 84:1B:38 has a network interface built by Shenzhen Excelsecu Data 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 84:1B:38:00:00:00 to 84:1B:38:FF:FF:FF.

OUI prefix: 84:1B:38
Hyphen form: 84-1B-38
MAC range: 84:1B:38:00:00:00 – 84:1B:38:FF:FF:FF
Addresses in block: 16,777,216
Organization: Shenzhen Excelsecu Data Technology Co.,Ltd
Address: Unit 701-709,7/F，South Block,SDGI Building A, No.2, Shenzhen Guangdong CN 518057
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 Shenzhen Excelsecu Data Technology Co.,Ltd

Shenzhen Excelsecu Data Technology Co.,Ltd holds 2 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

C4:D4:96

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 Excelsecu Data Technology Co.,Ltd"
archived source →
2026-07-17Assigned to "Shenzhen Excelsecu Data Technology Co.,Ltd"

Nearby in the registry

The prefixes assigned immediately before and after 84:1B:38:

FAQ

Which company owns MAC address prefix 84:1B:38?: MAC address prefix 84:1B:38 is registered to Shenzhen Excelsecu Data Technology Co.,Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 84:1B:38 has a network interface built by Shenzhen Excelsecu Data Technology Co.,Ltd.
What is the OUI 84:1B:38?: 84:1B:38 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Shenzhen Excelsecu Data Technology Co.,Ltd. It covers every address from 84:1B:38:00:00:00 to 84:1B:38:FF:FF:FF, or 16,777,216 addresses in total. It is also written 84-1B-38.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 84:1B:38:00:00:00 that is 84:1B:38 — 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 Excelsecu Data Technology Co.,Ltd located?: Shenzhen Excelsecu Data Technology Co.,Ltd is listed at Unit 701-709,7/F，South Block,SDGI Building A, No.2, Shenzhen Guangdong CN 518057 in the IEEE OUI registry entry for 84:1B:38. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does Shenzhen Excelsecu Data Technology Co.,Ltd own?: Shenzhen Excelsecu Data Technology Co.,Ltd holds 2 OUI prefixes in the IEEE registry, of which 84:1B:38 is one. A device made by Shenzhen Excelsecu Data Technology Co.,Ltd could carry a MAC address from any of them.