Which company owns MAC address prefix C0:3F:BB?

MAC address prefix C0:3F:BB is registered to Zhongshan Zhiniu Electronics Co.,Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C0:3F:BB has a network interface built by Zhongshan Zhiniu Electronics Co.,Ltd..

What is the OUI C0:3F:BB?

C0:3F:BB is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Zhongshan Zhiniu Electronics Co.,Ltd.. It covers every address from C0:3F:BB:00:00:00 to C0:3F:BB:FF:FF:FF, or 16,777,216 addresses in total. It is also written C0-3F-BB.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in C0:3F:BB:00:00:00 that is C0:3F:BB — 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 Zhongshan Zhiniu Electronics Co.,Ltd. located?

Zhongshan Zhiniu Electronics Co.,Ltd. is listed at 2nd Floor,Building B,No.15-1,Xinggang South Road,Gangkou Town,Zhongshan City,Guangdong Province Zhongshan CN 528400 in the IEEE OUI registry entry for C0:3F:BB. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Zhongshan Zhiniu Electronics Co.,Ltd.

MAC address prefix C0:3F:BB is registered to Zhongshan Zhiniu Electronics Co.,Ltd. in the IEEE OUI registry. Any device whose MAC address begins with C0:3F:BB has a network interface built by Zhongshan Zhiniu Electronics 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 C0:3F:BB:00:00:00 to C0:3F:BB:FF:FF:FF.

OUI prefix: C0:3F:BB
Hyphen form: C0-3F-BB
MAC range: C0:3F:BB:00:00:00 – C0:3F:BB:FF:FF:FF
Addresses in block: 16,777,216
Organization: Zhongshan Zhiniu Electronics Co.,Ltd.
Address: 2nd Floor,Building B,No.15-1,Xinggang South Road,Gangkou Town,Zhongshan City,Guangdong Province Zhongshan CN 528400
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.

2024-02-15Assigned to "Zhongshan Zhiniu Electronics Co.,Ltd."
archived source →
2026-07-17Assigned to "Zhongshan Zhiniu Electronics Co.,Ltd."

Nearby in the registry

The prefixes assigned immediately before and after C0:3F:BB:

FAQ

Which company owns MAC address prefix C0:3F:BB?: MAC address prefix C0:3F:BB is registered to Zhongshan Zhiniu Electronics Co.,Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C0:3F:BB has a network interface built by Zhongshan Zhiniu Electronics Co.,Ltd..
What is the OUI C0:3F:BB?: C0:3F:BB is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Zhongshan Zhiniu Electronics Co.,Ltd.. It covers every address from C0:3F:BB:00:00:00 to C0:3F:BB:FF:FF:FF, or 16,777,216 addresses in total. It is also written C0-3F-BB.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in C0:3F:BB:00:00:00 that is C0:3F:BB — 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 Zhongshan Zhiniu Electronics Co.,Ltd. located?: Zhongshan Zhiniu Electronics Co.,Ltd. is listed at 2nd Floor,Building B,No.15-1,Xinggang South Road,Gangkou Town,Zhongshan City,Guangdong Province Zhongshan CN 528400 in the IEEE OUI registry entry for C0:3F:BB. This is the address the organization registered with the IEEE, which may differ from its current operating address.