Which company owns MAC address prefix B0:3B:1B?

MAC address prefix B0:3B:1B is registered to Kontrolnext Technology (Beijing) Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B0:3B:1B has a network interface built by Kontrolnext Technology (Beijing) Ltd..

What is the OUI B0:3B:1B?

B0:3B:1B is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Kontrolnext Technology (Beijing) Ltd.. It covers every address from B0:3B:1B:00:00:00 to B0:3B:1B:FF:FF:FF, or 16,777,216 addresses in total. It is also written B0-3B-1B.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in B0:3B:1B:00:00:00 that is B0:3B:1B — 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 Kontrolnext Technology (Beijing) Ltd. located?

Kontrolnext Technology (Beijing) Ltd. is listed at Room 703, 7/F, Building No.16, Shixing Avenue 30#, Shijingshan District Beijing CN 100041 in the IEEE OUI registry entry for B0:3B:1B. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Kontrolnext Technology (Beijing) Ltd.

MAC address prefix B0:3B:1B is registered to Kontrolnext Technology (Beijing) Ltd. in the IEEE OUI registry. Any device whose MAC address begins with B0:3B:1B has a network interface built by Kontrolnext Technology (Beijing) 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 B0:3B:1B:00:00:00 to B0:3B:1B:FF:FF:FF.

OUI prefix: B0:3B:1B
Hyphen form: B0-3B-1B
MAC range: B0:3B:1B:00:00:00 – B0:3B:1B:FF:FF:FF
Addresses in block: 16,777,216
Organization: Kontrolnext Technology (Beijing) Ltd.
Address: Room 703, 7/F, Building No.16, Shixing Avenue 30#, Shijingshan District Beijing CN 100041
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.

2024-06-23Assigned to "Kontrolnext Technology (Beijing) Ltd."
archived source →
2026-07-17Assigned to "Kontrolnext Technology (Beijing) Ltd."

Nearby in the registry

The prefixes assigned immediately before and after B0:3B:1B:

FAQ

Which company owns MAC address prefix B0:3B:1B?: MAC address prefix B0:3B:1B is registered to Kontrolnext Technology (Beijing) Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B0:3B:1B has a network interface built by Kontrolnext Technology (Beijing) Ltd..
What is the OUI B0:3B:1B?: B0:3B:1B is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Kontrolnext Technology (Beijing) Ltd.. It covers every address from B0:3B:1B:00:00:00 to B0:3B:1B:FF:FF:FF, or 16,777,216 addresses in total. It is also written B0-3B-1B.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in B0:3B:1B:00:00:00 that is B0:3B:1B — 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 Kontrolnext Technology (Beijing) Ltd. located?: Kontrolnext Technology (Beijing) Ltd. is listed at Room 703, 7/F, Building No.16, Shixing Avenue 30#, Shijingshan District Beijing CN 100041 in the IEEE OUI registry entry for B0:3B:1B. This is the address the organization registered with the IEEE, which may differ from its current operating address.