Which company owns MAC address prefix 28:F5:32?

MAC address prefix 28:F5:32 is registered to ADD-Engineering BV in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 28:F5:32 has a network interface built by ADD-Engineering BV.

What is the OUI 28:F5:32?

28:F5:32 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to ADD-Engineering BV. It covers every address from 28:F5:32:00:00:00 to 28:F5:32:FF:FF:FF, or 16,777,216 addresses in total. It is also written 28-F5-32.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 28:F5:32:00:00:00 that is 28:F5:32 — 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 ADD-Engineering BV located?

ADD-Engineering BV is listed at P.O. BOX 5893 ROTTERDAM ZH NL 3008 AW in the IEEE OUI registry entry for 28:F5:32. This is the address the organization registered with the IEEE, which may differ from its current operating address.

ADD-Engineering BV

MAC address prefix 28:F5:32 is registered to ADD-Engineering BV in the IEEE OUI registry. Any device whose MAC address begins with 28:F5:32 has a network interface built by ADD-Engineering BV. 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 28:F5:32:00:00:00 to 28:F5:32:FF:FF:FF.

OUI prefix: 28:F5:32
Hyphen form: 28-F5-32
MAC range: 28:F5:32:00:00:00 – 28:F5:32:FF:FF:FF
Addresses in block: 16,777,216
Organization: ADD-Engineering BV
Address: P.O. BOX 5893 ROTTERDAM ZH NL 3008 AW
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 "ADD-Engineering BV"
archived source →
2026-07-17Assigned to "ADD-Engineering BV"

Nearby in the registry

The prefixes assigned immediately before and after 28:F5:32:

FAQ

Which company owns MAC address prefix 28:F5:32?: MAC address prefix 28:F5:32 is registered to ADD-Engineering BV in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 28:F5:32 has a network interface built by ADD-Engineering BV.
What is the OUI 28:F5:32?: 28:F5:32 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to ADD-Engineering BV. It covers every address from 28:F5:32:00:00:00 to 28:F5:32:FF:FF:FF, or 16,777,216 addresses in total. It is also written 28-F5-32.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 28:F5:32:00:00:00 that is 28:F5:32 — 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 ADD-Engineering BV located?: ADD-Engineering BV is listed at P.O. BOX 5893 ROTTERDAM ZH NL 3008 AW in the IEEE OUI registry entry for 28:F5:32. This is the address the organization registered with the IEEE, which may differ from its current operating address.