Which company owns MAC address prefix B0:1B:7C?

MAC address prefix B0:1B:7C is registered to Ontrol A.S. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B0:1B:7C has a network interface built by Ontrol A.S..

What is the OUI B0:1B:7C?

B0:1B:7C is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Ontrol A.S.. It covers every address from B0:1B:7C:00:00:00 to B0:1B:7C:FF:FF:FF, or 16,777,216 addresses in total. It is also written B0-1B-7C.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in B0:1B:7C:00:00:00 that is B0:1B:7C — 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 Ontrol A.S. located?

Ontrol A.S. is listed at Turcan Cad No:19 Y.Dudullu Umraniye Istanbul TR 34775 in the IEEE OUI registry entry for B0:1B:7C. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Ontrol A.S.

MAC address prefix B0:1B:7C is registered to Ontrol A.S. in the IEEE OUI registry. Any device whose MAC address begins with B0:1B:7C has a network interface built by Ontrol A.S.. 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 B0:1B:7C:00:00:00 to B0:1B:7C:FF:FF:FF.

OUI prefix: B0:1B:7C
Hyphen form: B0-1B-7C
MAC range: B0:1B:7C:00:00:00 – B0:1B:7C:FF:FF:FF
Addresses in block: 16,777,216
Organization: Ontrol A.S.
Address: Turcan Cad No:19 Y.Dudullu Umraniye Istanbul TR 34775
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 "Ontrol A.S."
archived source →
2026-07-17Assigned to "Ontrol A.S."

Nearby in the registry

The prefixes assigned immediately before and after B0:1B:7C:

FAQ

Which company owns MAC address prefix B0:1B:7C?: MAC address prefix B0:1B:7C is registered to Ontrol A.S. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B0:1B:7C has a network interface built by Ontrol A.S..
What is the OUI B0:1B:7C?: B0:1B:7C is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Ontrol A.S.. It covers every address from B0:1B:7C:00:00:00 to B0:1B:7C:FF:FF:FF, or 16,777,216 addresses in total. It is also written B0-1B-7C.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in B0:1B:7C:00:00:00 that is B0:1B:7C — 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 Ontrol A.S. located?: Ontrol A.S. is listed at Turcan Cad No:19 Y.Dudullu Umraniye Istanbul TR 34775 in the IEEE OUI registry entry for B0:1B:7C. This is the address the organization registered with the IEEE, which may differ from its current operating address.