Which company owns MAC address prefix 68:3F:1E?

MAC address prefix 68:3F:1E is registered to EFFECT Photonics B.V. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 68:3F:1E has a network interface built by EFFECT Photonics B.V..

What is the OUI 68:3F:1E?

68:3F:1E is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to EFFECT Photonics B.V.. It covers every address from 68:3F:1E:00:00:00 to 68:3F:1E:FF:FF:FF, or 16,777,216 addresses in total. It is also written 68-3F-1E.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 68:3F:1E:00:00:00 that is 68:3F:1E — 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 EFFECT Photonics B.V. located?

EFFECT Photonics B.V. is listed at Kastanjelaan 400 Eindhoven Noord-Brabant NL 5616 LZ in the IEEE OUI registry entry for 68:3F:1E. This is the address the organization registered with the IEEE, which may differ from its current operating address.

EFFECT Photonics B.V.

MAC address prefix 68:3F:1E is registered to EFFECT Photonics B.V. in the IEEE OUI registry. Any device whose MAC address begins with 68:3F:1E has a network interface built by EFFECT Photonics B.V.. 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 68:3F:1E:00:00:00 to 68:3F:1E:FF:FF:FF.

OUI prefix: 68:3F:1E
Hyphen form: 68-3F-1E
MAC range: 68:3F:1E:00:00:00 – 68:3F:1E:FF:FF:FF
Addresses in block: 16,777,216
Organization: EFFECT Photonics B.V.
Address: Kastanjelaan 400 Eindhoven Noord-Brabant NL 5616 LZ
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.

2019-07-04Assigned to "EFFECT Photonics B.V."
archived source →
2026-07-17Assigned to "EFFECT Photonics B.V."

Nearby in the registry

The prefixes assigned immediately before and after 68:3F:1E:

FAQ

Which company owns MAC address prefix 68:3F:1E?: MAC address prefix 68:3F:1E is registered to EFFECT Photonics B.V. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 68:3F:1E has a network interface built by EFFECT Photonics B.V..
What is the OUI 68:3F:1E?: 68:3F:1E is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to EFFECT Photonics B.V.. It covers every address from 68:3F:1E:00:00:00 to 68:3F:1E:FF:FF:FF, or 16,777,216 addresses in total. It is also written 68-3F-1E.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 68:3F:1E:00:00:00 that is 68:3F:1E — 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 EFFECT Photonics B.V. located?: EFFECT Photonics B.V. is listed at Kastanjelaan 400 Eindhoven Noord-Brabant NL 5616 LZ in the IEEE OUI registry entry for 68:3F:1E. This is the address the organization registered with the IEEE, which may differ from its current operating address.