Which company owns MAC address prefix EC:17:66?

MAC address prefix EC:17:66 is registered to Research Centre Module in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with EC:17:66 has a network interface built by Research Centre Module.

What is the OUI EC:17:66?

EC:17:66 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Research Centre Module. It covers every address from EC:17:66:00:00:00 to EC:17:66:FF:FF:FF, or 16,777,216 addresses in total. It is also written EC-17-66.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in EC:17:66:00:00:00 that is EC:17:66 — 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 Research Centre Module located?

Research Centre Module is listed at 3 Eight March 4Th Street Moscow Moscow RU 125190 in the IEEE OUI registry entry for EC:17:66. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Research Centre Module

MAC address prefix EC:17:66 is registered to Research Centre Module in the IEEE OUI registry. Any device whose MAC address begins with EC:17:66 has a network interface built by Research Centre Module. 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 EC:17:66:00:00:00 to EC:17:66:FF:FF:FF.

OUI prefix: EC:17:66
Hyphen form: EC-17-66
MAC range: EC:17:66:00:00:00 – EC:17:66:FF:FF:FF
Addresses in block: 16,777,216
Organization: Research Centre Module
Address: 3 Eight March 4Th Street Moscow Moscow RU 125190
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 "Research Centre Module"
archived source →
2026-07-17Assigned to "Research Centre Module"

Nearby in the registry

The prefixes assigned immediately before and after EC:17:66:

FAQ

Which company owns MAC address prefix EC:17:66?: MAC address prefix EC:17:66 is registered to Research Centre Module in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with EC:17:66 has a network interface built by Research Centre Module.
What is the OUI EC:17:66?: EC:17:66 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Research Centre Module. It covers every address from EC:17:66:00:00:00 to EC:17:66:FF:FF:FF, or 16,777,216 addresses in total. It is also written EC-17-66.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in EC:17:66:00:00:00 that is EC:17:66 — 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 Research Centre Module located?: Research Centre Module is listed at 3 Eight March 4Th Street Moscow Moscow RU 125190 in the IEEE OUI registry entry for EC:17:66. This is the address the organization registered with the IEEE, which may differ from its current operating address.