Which company owns MAC address prefix 90:5C:34?

MAC address prefix 90:5C:34 is registered to Sirius Electronic Systems Srl in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 90:5C:34 has a network interface built by Sirius Electronic Systems Srl.

What is the OUI 90:5C:34?

90:5C:34 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Sirius Electronic Systems Srl. It covers every address from 90:5C:34:00:00:00 to 90:5C:34:FF:FF:FF, or 16,777,216 addresses in total. It is also written 90-5C-34.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 90:5C:34:00:00:00 that is 90:5C:34 — 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 Sirius Electronic Systems Srl located?

Sirius Electronic Systems Srl is listed at via Robinie, 33 Gravellona Toce VB IT 28883 in the IEEE OUI registry entry for 90:5C:34. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Sirius Electronic Systems Srl

MAC address prefix 90:5C:34 is registered to Sirius Electronic Systems Srl in the IEEE OUI registry. Any device whose MAC address begins with 90:5C:34 has a network interface built by Sirius Electronic Systems Srl. 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 90:5C:34:00:00:00 to 90:5C:34:FF:FF:FF.

OUI prefix: 90:5C:34
Hyphen form: 90-5C-34
MAC range: 90:5C:34:00:00:00 – 90:5C:34:FF:FF:FF
Addresses in block: 16,777,216
Organization: Sirius Electronic Systems Srl
Address: via Robinie, 33 Gravellona Toce VB IT 28883
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.

2019-07-04Assigned to "Sirius Electronic Systems Srl"
archived source →
2026-07-17Assigned to "Sirius Electronic Systems Srl"

Nearby in the registry

The prefixes assigned immediately before and after 90:5C:34:

FAQ

Which company owns MAC address prefix 90:5C:34?: MAC address prefix 90:5C:34 is registered to Sirius Electronic Systems Srl in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 90:5C:34 has a network interface built by Sirius Electronic Systems Srl.
What is the OUI 90:5C:34?: 90:5C:34 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Sirius Electronic Systems Srl. It covers every address from 90:5C:34:00:00:00 to 90:5C:34:FF:FF:FF, or 16,777,216 addresses in total. It is also written 90-5C-34.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 90:5C:34:00:00:00 that is 90:5C:34 — 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 Sirius Electronic Systems Srl located?: Sirius Electronic Systems Srl is listed at via Robinie, 33 Gravellona Toce VB IT 28883 in the IEEE OUI registry entry for 90:5C:34. This is the address the organization registered with the IEEE, which may differ from its current operating address.