Which company owns MAC address prefix C0:B3:C8?

MAC address prefix C0:B3:C8 is registered to LLC "NTC Rotek" in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C0:B3:C8 has a network interface built by LLC "NTC Rotek".

What is the OUI C0:B3:C8?

C0:B3:C8 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to LLC "NTC Rotek". It covers every address from C0:B3:C8:00:00:00 to C0:B3:C8:FF:FF:FF, or 16,777,216 addresses in total. It is also written C0-B3-C8.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in C0:B3:C8:00:00:00 that is C0:B3:C8 — 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 LLC "NTC Rotek" located?

LLC "NTC Rotek" is listed at Russian Federation, Moscow, Nizhnyaya Krasnoselskaya st., house 5, building 6, room 03 Moscow RU 107140 in the IEEE OUI registry entry for C0:B3:C8. This is the address the organization registered with the IEEE, which may differ from its current operating address.

LLC "NTC Rotek"

MAC address prefix C0:B3:C8 is registered to LLC "NTC Rotek" in the IEEE OUI registry. Any device whose MAC address begins with C0:B3:C8 has a network interface built by LLC "NTC Rotek". 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:B3:C8:00:00:00 to C0:B3:C8:FF:FF:FF.

OUI prefix: C0:B3:C8
Hyphen form: C0-B3-C8
MAC range: C0:B3:C8:00:00:00 – C0:B3:C8:FF:FF:FF
Addresses in block: 16,777,216
Organization: LLC "NTC Rotek"
Address: Russian Federation, Moscow, Nizhnyaya Krasnoselskaya st., house 5, building 6, room 03 Moscow RU 107140
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.

2023-07-11Assigned to "LLC "NTC Rotek""
archived source →
2026-07-17Assigned to "LLC "NTC Rotek""

Nearby in the registry

The prefixes assigned immediately before and after C0:B3:C8:

FAQ

Which company owns MAC address prefix C0:B3:C8?: MAC address prefix C0:B3:C8 is registered to LLC "NTC Rotek" in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C0:B3:C8 has a network interface built by LLC "NTC Rotek".
What is the OUI C0:B3:C8?: C0:B3:C8 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to LLC "NTC Rotek". It covers every address from C0:B3:C8:00:00:00 to C0:B3:C8:FF:FF:FF, or 16,777,216 addresses in total. It is also written C0-B3-C8.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in C0:B3:C8:00:00:00 that is C0:B3:C8 — 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 LLC "NTC Rotek" located?: LLC "NTC Rotek" is listed at Russian Federation, Moscow, Nizhnyaya Krasnoselskaya st., house 5, building 6, room 03 Moscow RU 107140 in the IEEE OUI registry entry for C0:B3:C8. This is the address the organization registered with the IEEE, which may differ from its current operating address.