Which company owns MAC address prefix EC:66:D1?

MAC address prefix EC:66:D1 is registered to B&W Group LTD in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with EC:66:D1 has a network interface built by B&W Group LTD.

What is the OUI EC:66:D1?

EC:66:D1 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to B&W Group LTD. It covers every address from EC:66:D1:00:00:00 to EC:66:D1:FF:FF:FF, or 16,777,216 addresses in total. It is also written EC-66-D1.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in EC:66:D1:00:00:00 that is EC:66:D1 — 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 B&W Group LTD located?

B&W Group LTD is listed at Dale Road Worthing Sussex GB BN11 2BH in the IEEE OUI registry entry for EC:66:D1. This is the address the organization registered with the IEEE, which may differ from its current operating address.

B&W Group LTD

MAC address prefix EC:66:D1 is registered to B&W Group LTD in the IEEE OUI registry. Any device whose MAC address begins with EC:66:D1 has a network interface built by B&W Group LTD. 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:66:D1:00:00:00 to EC:66:D1:FF:FF:FF.

OUI prefix: EC:66:D1
Hyphen form: EC-66-D1
MAC range: EC:66:D1:00:00:00 – EC:66:D1:FF:FF:FF
Addresses in block: 16,777,216
Organization: B&W Group LTD
Address: Dale Road Worthing Sussex GB BN11 2BH
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 "B&W Group LTD"
archived source →
2026-07-17Assigned to "B&W Group LTD"

Nearby in the registry

The prefixes assigned immediately before and after EC:66:D1:

FAQ

Which company owns MAC address prefix EC:66:D1?: MAC address prefix EC:66:D1 is registered to B&W Group LTD in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with EC:66:D1 has a network interface built by B&W Group LTD.
What is the OUI EC:66:D1?: EC:66:D1 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to B&W Group LTD. It covers every address from EC:66:D1:00:00:00 to EC:66:D1:FF:FF:FF, or 16,777,216 addresses in total. It is also written EC-66-D1.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in EC:66:D1:00:00:00 that is EC:66:D1 — 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 B&W Group LTD located?: B&W Group LTD is listed at Dale Road Worthing Sussex GB BN11 2BH in the IEEE OUI registry entry for EC:66:D1. This is the address the organization registered with the IEEE, which may differ from its current operating address.