Which company owns MAC address prefix 08:CB:E5?

MAC address prefix 08:CB:E5 is registered to R3 Solutions GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 08:CB:E5 has a network interface built by R3 Solutions GmbH.

What is the OUI 08:CB:E5?

08:CB:E5 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to R3 Solutions GmbH. It covers every address from 08:CB:E5:00:00:00 to 08:CB:E5:FF:FF:FF, or 16,777,216 addresses in total. It is also written 08-CB-E5.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 08:CB:E5:00:00:00 that is 08:CB:E5 — 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 R3 Solutions GmbH located?

R3 Solutions GmbH is listed at Kurfürstendamm 194 Berlin DE 10707 in the IEEE OUI registry entry for 08:CB:E5. This is the address the organization registered with the IEEE, which may differ from its current operating address.

R3 Solutions GmbH

MAC address prefix 08:CB:E5 is registered to R3 Solutions GmbH in the IEEE OUI registry. Any device whose MAC address begins with 08:CB:E5 has a network interface built by R3 Solutions 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 08:CB:E5:00:00:00 to 08:CB:E5:FF:FF:FF.

OUI prefix: 08:CB:E5
Hyphen form: 08-CB-E5
MAC range: 08:CB:E5:00:00:00 – 08:CB:E5:FF:FF:FF
Addresses in block: 16,777,216
Organization: R3 Solutions GmbH
Address: Kurfürstendamm 194 Berlin DE 10707
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 (3)

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

2020-11-28Assigned to "R3 - Reliable Realtime Radio Communications GmbH"
archived source →
2022-07-11Renamed from "R3 - Reliable Realtime Radio Communications GmbH" to "R3 Solutions GmbH"
archived source →
2026-07-17Assigned to "R3 Solutions GmbH"

Nearby in the registry

The prefixes assigned immediately before and after 08:CB:E5:

FAQ

Which company owns MAC address prefix 08:CB:E5?: MAC address prefix 08:CB:E5 is registered to R3 Solutions GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 08:CB:E5 has a network interface built by R3 Solutions GmbH.
What is the OUI 08:CB:E5?: 08:CB:E5 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to R3 Solutions GmbH. It covers every address from 08:CB:E5:00:00:00 to 08:CB:E5:FF:FF:FF, or 16,777,216 addresses in total. It is also written 08-CB-E5.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 08:CB:E5:00:00:00 that is 08:CB:E5 — 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 R3 Solutions GmbH located?: R3 Solutions GmbH is listed at Kurfürstendamm 194 Berlin DE 10707 in the IEEE OUI registry entry for 08:CB:E5. This is the address the organization registered with the IEEE, which may differ from its current operating address.