Which company owns MAC address prefix 30:18:CF?

MAC address prefix 30:18:CF is registered to DEOS control systems GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 30:18:CF has a network interface built by DEOS control systems GmbH.

What is the OUI 30:18:CF?

30:18:CF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to DEOS control systems GmbH. It covers every address from 30:18:CF:00:00:00 to 30:18:CF:FF:FF:FF, or 16,777,216 addresses in total. It is also written 30-18-CF.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 30:18:CF:00:00:00 that is 30:18:CF — 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 DEOS control systems GmbH located?

DEOS control systems GmbH is listed at Birkenallee 113 Rheine NRW DE 48432 in the IEEE OUI registry entry for 30:18:CF. This is the address the organization registered with the IEEE, which may differ from its current operating address.

DEOS control systems GmbH

MAC address prefix 30:18:CF is registered to DEOS control systems GmbH in the IEEE OUI registry. Any device whose MAC address begins with 30:18:CF has a network interface built by DEOS control systems 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 30:18:CF:00:00:00 to 30:18:CF:FF:FF:FF.

OUI prefix: 30:18:CF
Hyphen form: 30-18-CF
MAC range: 30:18:CF:00:00:00 – 30:18:CF:FF:FF:FF
Addresses in block: 16,777,216
Organization: DEOS control systems GmbH
Address: Birkenallee 113 Rheine NRW DE 48432
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 "DEOS control systems GmbH"
archived source →
2026-07-17Assigned to "DEOS control systems GmbH"

Nearby in the registry

The prefixes assigned immediately before and after 30:18:CF:

FAQ

Which company owns MAC address prefix 30:18:CF?: MAC address prefix 30:18:CF is registered to DEOS control systems GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 30:18:CF has a network interface built by DEOS control systems GmbH.
What is the OUI 30:18:CF?: 30:18:CF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to DEOS control systems GmbH. It covers every address from 30:18:CF:00:00:00 to 30:18:CF:FF:FF:FF, or 16,777,216 addresses in total. It is also written 30-18-CF.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 30:18:CF:00:00:00 that is 30:18:CF — 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 DEOS control systems GmbH located?: DEOS control systems GmbH is listed at Birkenallee 113 Rheine NRW DE 48432 in the IEEE OUI registry entry for 30:18:CF. This is the address the organization registered with the IEEE, which may differ from its current operating address.