Which company owns MAC address prefix B8:0B:9D?

MAC address prefix B8:0B:9D is registered to ROPEX Industrie-Elektronik GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B8:0B:9D has a network interface built by ROPEX Industrie-Elektronik GmbH.

What is the OUI B8:0B:9D?

B8:0B:9D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to ROPEX Industrie-Elektronik GmbH. It covers every address from B8:0B:9D:00:00:00 to B8:0B:9D:FF:FF:FF, or 16,777,216 addresses in total. It is also written B8-0B-9D.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in B8:0B:9D:00:00:00 that is B8:0B:9D — 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 ROPEX Industrie-Elektronik GmbH located?

ROPEX Industrie-Elektronik GmbH is listed at Adolf-Heim-Str. 4 Bietigheim-Bissingen Baden Wuerttemberg DE 74321 in the IEEE OUI registry entry for B8:0B:9D. This is the address the organization registered with the IEEE, which may differ from its current operating address.

ROPEX Industrie-Elektronik GmbH

MAC address prefix B8:0B:9D is registered to ROPEX Industrie-Elektronik GmbH in the IEEE OUI registry. Any device whose MAC address begins with B8:0B:9D has a network interface built by ROPEX Industrie-Elektronik 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 B8:0B:9D:00:00:00 to B8:0B:9D:FF:FF:FF.

OUI prefix: B8:0B:9D
Hyphen form: B8-0B-9D
MAC range: B8:0B:9D:00:00:00 – B8:0B:9D:FF:FF:FF
Addresses in block: 16,777,216
Organization: ROPEX Industrie-Elektronik GmbH
Address: Adolf-Heim-Str. 4 Bietigheim-Bissingen Baden Wuerttemberg DE 74321
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 "ROPEX Industrie-Elektronik GmbH"
archived source →
2026-07-17Assigned to "ROPEX Industrie-Elektronik GmbH"

Nearby in the registry

The prefixes assigned immediately before and after B8:0B:9D:

FAQ

Which company owns MAC address prefix B8:0B:9D?: MAC address prefix B8:0B:9D is registered to ROPEX Industrie-Elektronik GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B8:0B:9D has a network interface built by ROPEX Industrie-Elektronik GmbH.
What is the OUI B8:0B:9D?: B8:0B:9D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to ROPEX Industrie-Elektronik GmbH. It covers every address from B8:0B:9D:00:00:00 to B8:0B:9D:FF:FF:FF, or 16,777,216 addresses in total. It is also written B8-0B-9D.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in B8:0B:9D:00:00:00 that is B8:0B:9D — 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 ROPEX Industrie-Elektronik GmbH located?: ROPEX Industrie-Elektronik GmbH is listed at Adolf-Heim-Str. 4 Bietigheim-Bissingen Baden Wuerttemberg DE 74321 in the IEEE OUI registry entry for B8:0B:9D. This is the address the organization registered with the IEEE, which may differ from its current operating address.