Which company owns MAC address prefix D8:2D:40?

MAC address prefix D8:2D:40 is registered to Janz - Contagem e Gestão de Fluídos S.A. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with D8:2D:40 has a network interface built by Janz - Contagem e Gestão de Fluídos S.A..

What is the OUI D8:2D:40?

D8:2D:40 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Janz - Contagem e Gestão de Fluídos S.A.. It covers every address from D8:2D:40:00:00:00 to D8:2D:40:FF:FF:FF, or 16,777,216 addresses in total. It is also written D8-2D-40.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in D8:2D:40:00:00:00 that is D8:2D:40 — 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 Janz - Contagem e Gestão de Fluídos S.A. located?

Janz - Contagem e Gestão de Fluídos S.A. is listed at Av. Infante Dom Henrique, 288 Lisboa PT 1950-421 in the IEEE OUI registry entry for D8:2D:40. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Janz - Contagem e Gestão de Fluídos S.A.

MAC address prefix D8:2D:40 is registered to Janz - Contagem e Gestão de Fluídos S.A. in the IEEE OUI registry. Any device whose MAC address begins with D8:2D:40 has a network interface built by Janz - Contagem e Gestão de Fluídos S.A.. 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 D8:2D:40:00:00:00 to D8:2D:40:FF:FF:FF.

OUI prefix: D8:2D:40
Hyphen form: D8-2D-40
MAC range: D8:2D:40:00:00:00 – D8:2D:40:FF:FF:FF
Addresses in block: 16,777,216
Organization: Janz - Contagem e Gestão de Fluídos S.A.
Address: Av. Infante Dom Henrique, 288 Lisboa PT 1950-421
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 "Janz - Contagem e Gestão de Fluídos S.A."
archived source →
2026-07-17Assigned to "Janz - Contagem e Gestão de Fluídos S.A."

Nearby in the registry

The prefixes assigned immediately before and after D8:2D:40:

FAQ

Which company owns MAC address prefix D8:2D:40?: MAC address prefix D8:2D:40 is registered to Janz - Contagem e Gestão de Fluídos S.A. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with D8:2D:40 has a network interface built by Janz - Contagem e Gestão de Fluídos S.A..
What is the OUI D8:2D:40?: D8:2D:40 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Janz - Contagem e Gestão de Fluídos S.A.. It covers every address from D8:2D:40:00:00:00 to D8:2D:40:FF:FF:FF, or 16,777,216 addresses in total. It is also written D8-2D-40.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in D8:2D:40:00:00:00 that is D8:2D:40 — 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 Janz - Contagem e Gestão de Fluídos S.A. located?: Janz - Contagem e Gestão de Fluídos S.A. is listed at Av. Infante Dom Henrique, 288 Lisboa PT 1950-421 in the IEEE OUI registry entry for D8:2D:40. This is the address the organization registered with the IEEE, which may differ from its current operating address.