Which company owns MAC address prefix 34:78:77?

MAC address prefix 34:78:77 is registered to O-Net Communications (Shenzhen) Limited in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 34:78:77 has a network interface built by O-Net Communications (Shenzhen) Limited.

What is the OUI 34:78:77?

34:78:77 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to O-Net Communications (Shenzhen) Limited. It covers every address from 34:78:77:00:00:00 to 34:78:77:FF:FF:FF, or 16,777,216 addresses in total. It is also written 34-78-77.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 34:78:77:00:00:00 that is 34:78:77 — 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 O-Net Communications (Shenzhen) Limited located?

O-Net Communications (Shenzhen) Limited is listed at #10-1 South,Maqueling Industrial Park,Nanshan District Shenzhen Guangdong CN 518057 in the IEEE OUI registry entry for 34:78:77. This is the address the organization registered with the IEEE, which may differ from its current operating address.

O-Net Communications (Shenzhen) Limited

MAC address prefix 34:78:77 is registered to O-Net Communications (Shenzhen) Limited in the IEEE OUI registry. Any device whose MAC address begins with 34:78:77 has a network interface built by O-Net Communications (Shenzhen) Limited. 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 34:78:77:00:00:00 to 34:78:77:FF:FF:FF.

OUI prefix: 34:78:77
Hyphen form: 34-78-77
MAC range: 34:78:77:00:00:00 – 34:78:77:FF:FF:FF
Addresses in block: 16,777,216
Organization: O-Net Communications (Shenzhen) Limited
Address: #10-1 South,Maqueling Industrial Park,Nanshan District 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.

Assignment history (3)

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 "O-NET Communications(Shenzhen) Limited"
archived source →
2017-09-08Renamed from "O-NET Communications(Shenzhen) Limited" to "O-Net Communications (Shenzhen) Limited"
archived source →
2026-07-17Assigned to "O-Net Communications (Shenzhen) Limited"

Nearby in the registry

The prefixes assigned immediately before and after 34:78:77:

FAQ

Which company owns MAC address prefix 34:78:77?: MAC address prefix 34:78:77 is registered to O-Net Communications (Shenzhen) Limited in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 34:78:77 has a network interface built by O-Net Communications (Shenzhen) Limited.
What is the OUI 34:78:77?: 34:78:77 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to O-Net Communications (Shenzhen) Limited. It covers every address from 34:78:77:00:00:00 to 34:78:77:FF:FF:FF, or 16,777,216 addresses in total. It is also written 34-78-77.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 34:78:77:00:00:00 that is 34:78:77 — 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 O-Net Communications (Shenzhen) Limited located?: O-Net Communications (Shenzhen) Limited is listed at #10-1 South,Maqueling Industrial Park,Nanshan District Shenzhen Guangdong CN 518057 in the IEEE OUI registry entry for 34:78:77. This is the address the organization registered with the IEEE, which may differ from its current operating address.