Which company owns MAC address prefix 78:99:5C?

MAC address prefix 78:99:5C is registered to Nationz Technologies Inc in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 78:99:5C has a network interface built by Nationz Technologies Inc.

What is the OUI 78:99:5C?

78:99:5C is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Nationz Technologies Inc. It covers every address from 78:99:5C:00:00:00 to 78:99:5C:FF:FF:FF, or 16,777,216 addresses in total. It is also written 78-99-5C.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 78:99:5C:00:00:00 that is 78:99:5C — 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 Nationz Technologies Inc located?

Nationz Technologies Inc is listed at 12F,Tower Building #3,China Academy of Science and Technology Development,Gaoxin South Ave.1 Shen Zhen GuangDong CN 518057 in the IEEE OUI registry entry for 78:99:5C. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Nationz Technologies Inc

MAC address prefix 78:99:5C is registered to Nationz Technologies Inc in the IEEE OUI registry. Any device whose MAC address begins with 78:99:5C has a network interface built by Nationz Technologies Inc. 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 78:99:5C:00:00:00 to 78:99:5C:FF:FF:FF.

OUI prefix: 78:99:5C
Hyphen form: 78-99-5C
MAC range: 78:99:5C:00:00:00 – 78:99:5C:FF:FF:FF
Addresses in block: 16,777,216
Organization: Nationz Technologies Inc
Address: 12F,Tower Building #3,China Academy of Science and Technology Development,Gaoxin South Ave.1 Shen Zhen 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.

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 "Nationz Technologies Inc"
archived source →
2026-07-17Assigned to "Nationz Technologies Inc"

Nearby in the registry

The prefixes assigned immediately before and after 78:99:5C:

FAQ

Which company owns MAC address prefix 78:99:5C?: MAC address prefix 78:99:5C is registered to Nationz Technologies Inc in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 78:99:5C has a network interface built by Nationz Technologies Inc.
What is the OUI 78:99:5C?: 78:99:5C is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Nationz Technologies Inc. It covers every address from 78:99:5C:00:00:00 to 78:99:5C:FF:FF:FF, or 16,777,216 addresses in total. It is also written 78-99-5C.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 78:99:5C:00:00:00 that is 78:99:5C — 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 Nationz Technologies Inc located?: Nationz Technologies Inc is listed at 12F,Tower Building #3,China Academy of Science and Technology Development,Gaoxin South Ave.1 Shen Zhen GuangDong CN 518057 in the IEEE OUI registry entry for 78:99:5C. This is the address the organization registered with the IEEE, which may differ from its current operating address.