Which company owns MAC address prefix 84:DE:3D?

MAC address prefix 84:DE:3D is registered to Crystal Vision Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 84:DE:3D has a network interface built by Crystal Vision Ltd.

What is the OUI 84:DE:3D?

84:DE:3D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Crystal Vision Ltd. It covers every address from 84:DE:3D:00:00:00 to 84:DE:3D:FF:FF:FF, or 16,777,216 addresses in total. It is also written 84-DE-3D.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 84:DE:3D:00:00:00 that is 84:DE:3D — 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 Crystal Vision Ltd located?

Crystal Vision Ltd is listed at Lion Technology park Whittlesford/ Cambridge Cambs GB CB22 4WL in the IEEE OUI registry entry for 84:DE:3D. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Crystal Vision Ltd

MAC address prefix 84:DE:3D is registered to Crystal Vision Ltd in the IEEE OUI registry. Any device whose MAC address begins with 84:DE:3D has a network interface built by Crystal Vision 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 84:DE:3D:00:00:00 to 84:DE:3D:FF:FF:FF.

OUI prefix: 84:DE:3D
Hyphen form: 84-DE-3D
MAC range: 84:DE:3D:00:00:00 – 84:DE:3D:FF:FF:FF
Addresses in block: 16,777,216
Organization: Crystal Vision Ltd
Address: Lion Technology park Whittlesford/ Cambridge Cambs GB CB22 4WL
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 "Crystal Vision Ltd"
archived source →
2026-07-17Assigned to "Crystal Vision Ltd"

Nearby in the registry

The prefixes assigned immediately before and after 84:DE:3D:

FAQ

Which company owns MAC address prefix 84:DE:3D?: MAC address prefix 84:DE:3D is registered to Crystal Vision Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 84:DE:3D has a network interface built by Crystal Vision Ltd.
What is the OUI 84:DE:3D?: 84:DE:3D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Crystal Vision Ltd. It covers every address from 84:DE:3D:00:00:00 to 84:DE:3D:FF:FF:FF, or 16,777,216 addresses in total. It is also written 84-DE-3D.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 84:DE:3D:00:00:00 that is 84:DE:3D — 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 Crystal Vision Ltd located?: Crystal Vision Ltd is listed at Lion Technology park Whittlesford/ Cambridge Cambs GB CB22 4WL in the IEEE OUI registry entry for 84:DE:3D. This is the address the organization registered with the IEEE, which may differ from its current operating address.