Which company owns MAC address prefix 90:27:78?

MAC address prefix 90:27:78 is registered to Open Infrastructure in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 90:27:78 has a network interface built by Open Infrastructure.

What is the OUI 90:27:78?

90:27:78 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Open Infrastructure. It covers every address from 90:27:78:00:00:00 to 90:27:78:FF:FF:FF, or 16,777,216 addresses in total. It is also written 90-27-78.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 90:27:78:00:00:00 that is 90:27:78 — 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 Open Infrastructure located?

Open Infrastructure is listed at Neufeldstrasse 125 Bern CH 3012 in the IEEE OUI registry entry for 90:27:78. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Open Infrastructure

MAC address prefix 90:27:78 is registered to Open Infrastructure in the IEEE OUI registry. Any device whose MAC address begins with 90:27:78 has a network interface built by Open Infrastructure. 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 90:27:78:00:00:00 to 90:27:78:FF:FF:FF.

OUI prefix: 90:27:78
Hyphen form: 90-27-78
MAC range: 90:27:78:00:00:00 – 90:27:78:FF:FF:FF
Addresses in block: 16,777,216
Organization: Open Infrastructure
Address: Neufeldstrasse 125 Bern CH 3012
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 (1)

The IEEE registry publishes current state only — this is the change record we've kept since we started tracking it daily.

2026-07-17Assigned to "Open Infrastructure"

Nearby in the registry

The prefixes assigned immediately before and after 90:27:78:

FAQ

Which company owns MAC address prefix 90:27:78?: MAC address prefix 90:27:78 is registered to Open Infrastructure in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 90:27:78 has a network interface built by Open Infrastructure.
What is the OUI 90:27:78?: 90:27:78 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Open Infrastructure. It covers every address from 90:27:78:00:00:00 to 90:27:78:FF:FF:FF, or 16,777,216 addresses in total. It is also written 90-27-78.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 90:27:78:00:00:00 that is 90:27:78 — 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 Open Infrastructure located?: Open Infrastructure is listed at Neufeldstrasse 125 Bern CH 3012 in the IEEE OUI registry entry for 90:27:78. This is the address the organization registered with the IEEE, which may differ from its current operating address.