Which company owns MAC address prefix 00:80:66?

MAC address prefix 00:80:66 is registered to Eurotech S.p.A. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 00:80:66 has a network interface built by Eurotech S.p.A..

What is the OUI 00:80:66?

00:80:66 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Eurotech S.p.A.. It covers every address from 00:80:66:00:00:00 to 00:80:66:FF:FF:FF, or 16,777,216 addresses in total. It is also written 00-80-66.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 00:80:66:00:00:00 that is 00:80:66 — 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 Eurotech S.p.A. located?

Eurotech S.p.A. is listed at Via Fratelli Solari 3/A Amaro Udine GB 33020 in the IEEE OUI registry entry for 00:80:66. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Eurotech S.p.A.

MAC address prefix 00:80:66 is registered to Eurotech S.p.A. in the IEEE OUI registry. Any device whose MAC address begins with 00:80:66 has a network interface built by Eurotech S.p.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 00:80:66:00:00:00 to 00:80:66:FF:FF:FF.

OUI prefix: 00:80:66
Hyphen form: 00-80-66
MAC range: 00:80:66:00:00:00 – 00:80:66:FF:FF:FF
Addresses in block: 16,777,216
Organization: Eurotech S.p.A.
Address: Via Fratelli Solari 3/A Amaro Udine GB 33020
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 (3)

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 "ARCOM CONTROL SYSTEMS, LTD."
archived source →
2024-02-15Renamed from "ARCOM CONTROL SYSTEMS, LTD." to "Eurotech S.p.A."
archived source →
2026-07-17Assigned to "Eurotech S.p.A."

Nearby in the registry

The prefixes assigned immediately before and after 00:80:66:

FAQ

Which company owns MAC address prefix 00:80:66?: MAC address prefix 00:80:66 is registered to Eurotech S.p.A. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 00:80:66 has a network interface built by Eurotech S.p.A..
What is the OUI 00:80:66?: 00:80:66 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Eurotech S.p.A.. It covers every address from 00:80:66:00:00:00 to 00:80:66:FF:FF:FF, or 16,777,216 addresses in total. It is also written 00-80-66.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 00:80:66:00:00:00 that is 00:80:66 — 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 Eurotech S.p.A. located?: Eurotech S.p.A. is listed at Via Fratelli Solari 3/A Amaro Udine GB 33020 in the IEEE OUI registry entry for 00:80:66. This is the address the organization registered with the IEEE, which may differ from its current operating address.