Which company owns MAC address prefix 90:A2:DA?

MAC address prefix 90:A2:DA is registered to GHEO SA in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 90:A2:DA has a network interface built by GHEO SA.

What is the OUI 90:A2:DA?

90:A2:DA is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to GHEO SA. It covers every address from 90:A2:DA:00:00:00 to 90:A2:DA:FF:FF:FF, or 16,777,216 addresses in total. It is also written 90-A2-DA.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 90:A2:DA:00:00:00 that is 90:A2:DA — 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 GHEO SA located?

GHEO SA is listed at Via Soldini, 22 Chiasso CH CH-6830 in the IEEE OUI registry entry for 90:A2:DA. This is the address the organization registered with the IEEE, which may differ from its current operating address.

GHEO SA

MAC address prefix 90:A2:DA is registered to GHEO SA in the IEEE OUI registry. Any device whose MAC address begins with 90:A2:DA has a network interface built by GHEO SA. 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:A2:DA:00:00:00 to 90:A2:DA:FF:FF:FF.

OUI prefix: 90:A2:DA
Hyphen form: 90-A2-DA
MAC range: 90:A2:DA:00:00:00 – 90:A2:DA:FF:FF:FF
Addresses in block: 16,777,216
Organization: GHEO SA
Address: Via Soldini, 22 Chiasso CH CH-6830
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 "GHEO SA"
archived source →
2026-07-17Assigned to "GHEO SA"

Nearby in the registry

The prefixes assigned immediately before and after 90:A2:DA:

FAQ

Which company owns MAC address prefix 90:A2:DA?: MAC address prefix 90:A2:DA is registered to GHEO SA in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 90:A2:DA has a network interface built by GHEO SA.
What is the OUI 90:A2:DA?: 90:A2:DA is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to GHEO SA. It covers every address from 90:A2:DA:00:00:00 to 90:A2:DA:FF:FF:FF, or 16,777,216 addresses in total. It is also written 90-A2-DA.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 90:A2:DA:00:00:00 that is 90:A2:DA — 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 GHEO SA located?: GHEO SA is listed at Via Soldini, 22 Chiasso CH CH-6830 in the IEEE OUI registry entry for 90:A2:DA. This is the address the organization registered with the IEEE, which may differ from its current operating address.