Which company owns MAC address prefix 18:44:CF?

MAC address prefix 18:44:CF is registered to B+L Industrial Measurements GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 18:44:CF has a network interface built by B+L Industrial Measurements GmbH.

What is the OUI 18:44:CF?

18:44:CF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to B+L Industrial Measurements GmbH. It covers every address from 18:44:CF:00:00:00 to 18:44:CF:FF:FF:FF, or 16,777,216 addresses in total. It is also written 18-44-CF.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 18:44:CF:00:00:00 that is 18:44: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 B+L Industrial Measurements GmbH located?

B+L Industrial Measurements GmbH is listed at Hans-Bunte-Strasse 10 Heidelberg DE 69123 in the IEEE OUI registry entry for 18:44:CF. This is the address the organization registered with the IEEE, which may differ from its current operating address.

B+L Industrial Measurements GmbH

MAC address prefix 18:44:CF is registered to B+L Industrial Measurements GmbH in the IEEE OUI registry. Any device whose MAC address begins with 18:44:CF has a network interface built by B+L Industrial Measurements 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 18:44:CF:00:00:00 to 18:44:CF:FF:FF:FF.

OUI prefix: 18:44:CF
Hyphen form: 18-44-CF
MAC range: 18:44:CF:00:00:00 – 18:44:CF:FF:FF:FF
Addresses in block: 16,777,216
Organization: B+L Industrial Measurements GmbH
Address: Hans-Bunte-Strasse 10 Heidelberg DE 69123
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 "B+L Industrial Measurements GmbH"
archived source →
2026-07-17Assigned to "B+L Industrial Measurements GmbH"

Nearby in the registry

The prefixes assigned immediately before and after 18:44:CF:

FAQ

Which company owns MAC address prefix 18:44:CF?: MAC address prefix 18:44:CF is registered to B+L Industrial Measurements GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 18:44:CF has a network interface built by B+L Industrial Measurements GmbH.
What is the OUI 18:44:CF?: 18:44:CF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to B+L Industrial Measurements GmbH. It covers every address from 18:44:CF:00:00:00 to 18:44:CF:FF:FF:FF, or 16,777,216 addresses in total. It is also written 18-44-CF.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 18:44:CF:00:00:00 that is 18:44: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 B+L Industrial Measurements GmbH located?: B+L Industrial Measurements GmbH is listed at Hans-Bunte-Strasse 10 Heidelberg DE 69123 in the IEEE OUI registry entry for 18:44:CF. This is the address the organization registered with the IEEE, which may differ from its current operating address.