Which company owns MAC address prefix C0:0A:CA?

MAC address prefix C0:0A:CA is registered to SafeSquare GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C0:0A:CA has a network interface built by SafeSquare GmbH.

What is the OUI C0:0A:CA?

C0:0A:CA is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to SafeSquare GmbH. It covers every address from C0:0A:CA:00:00:00 to C0:0A:CA:FF:FF:FF, or 16,777,216 addresses in total. It is also written C0-0A-CA.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in C0:0A:CA:00:00:00 that is C0:0A:CA — 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 SafeSquare GmbH located?

SafeSquare GmbH is listed at Am Graben 2-6 Radevormwald DE 42477 in the IEEE OUI registry entry for C0:0A:CA. This is the address the organization registered with the IEEE, which may differ from its current operating address.

SafeSquare GmbH

MAC address prefix C0:0A:CA is registered to SafeSquare GmbH in the IEEE OUI registry. Any device whose MAC address begins with C0:0A:CA has a network interface built by SafeSquare GmbH. 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 C0:0A:CA:00:00:00 to C0:0A:CA:FF:FF:FF.

OUI prefix: C0:0A:CA
Hyphen form: C0-0A-CA
MAC range: C0:0A:CA:00:00:00 – C0:0A:CA:FF:FF:FF
Addresses in block: 16,777,216
Organization: SafeSquare GmbH
Address: Am Graben 2-6 Radevormwald DE 42477
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 (1)

The IEEE registry publishes current state only — this is the change record we've kept since we started tracking it daily.

2026-07-17Assigned to "SafeSquare GmbH"

Nearby in the registry

The prefixes assigned immediately before and after C0:0A:CA:

FAQ

Which company owns MAC address prefix C0:0A:CA?: MAC address prefix C0:0A:CA is registered to SafeSquare GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C0:0A:CA has a network interface built by SafeSquare GmbH.
What is the OUI C0:0A:CA?: C0:0A:CA is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to SafeSquare GmbH. It covers every address from C0:0A:CA:00:00:00 to C0:0A:CA:FF:FF:FF, or 16,777,216 addresses in total. It is also written C0-0A-CA.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in C0:0A:CA:00:00:00 that is C0:0A:CA — 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 SafeSquare GmbH located?: SafeSquare GmbH is listed at Am Graben 2-6 Radevormwald DE 42477 in the IEEE OUI registry entry for C0:0A:CA. This is the address the organization registered with the IEEE, which may differ from its current operating address.