Which company owns MAC address prefix 20:66:FD?

MAC address prefix 20:66:FD is registered to CONSTELL8 NV in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 20:66:FD has a network interface built by CONSTELL8 NV.

What is the OUI 20:66:FD?

20:66:FD is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to CONSTELL8 NV. It covers every address from 20:66:FD:00:00:00 to 20:66:FD:FF:FF:FF, or 16,777,216 addresses in total. It is also written 20-66-FD.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 20:66:FD:00:00:00 that is 20:66:FD — 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 CONSTELL8 NV located?

CONSTELL8 NV is listed at Sint-Bernardse steenweg 72 Hemiksem BE 2620 in the IEEE OUI registry entry for 20:66:FD. This is the address the organization registered with the IEEE, which may differ from its current operating address.

CONSTELL8 NV

MAC address prefix 20:66:FD is registered to CONSTELL8 NV in the IEEE OUI registry. Any device whose MAC address begins with 20:66:FD has a network interface built by CONSTELL8 NV. 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 20:66:FD:00:00:00 to 20:66:FD:FF:FF:FF.

OUI prefix: 20:66:FD
Hyphen form: 20-66-FD
MAC range: 20:66:FD:00:00:00 – 20:66:FD:FF:FF:FF
Addresses in block: 16,777,216
Organization: CONSTELL8 NV
Address: Sint-Bernardse steenweg 72 Hemiksem BE 2620
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.

2022-07-11Assigned to "CONSTELL8 NV"
archived source →
2026-07-17Assigned to "CONSTELL8 NV"

Nearby in the registry

The prefixes assigned immediately before and after 20:66:FD:

FAQ

Which company owns MAC address prefix 20:66:FD?: MAC address prefix 20:66:FD is registered to CONSTELL8 NV in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 20:66:FD has a network interface built by CONSTELL8 NV.
What is the OUI 20:66:FD?: 20:66:FD is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to CONSTELL8 NV. It covers every address from 20:66:FD:00:00:00 to 20:66:FD:FF:FF:FF, or 16,777,216 addresses in total. It is also written 20-66-FD.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 20:66:FD:00:00:00 that is 20:66:FD — 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 CONSTELL8 NV located?: CONSTELL8 NV is listed at Sint-Bernardse steenweg 72 Hemiksem BE 2620 in the IEEE OUI registry entry for 20:66:FD. This is the address the organization registered with the IEEE, which may differ from its current operating address.