Which company owns MAC address prefix 1C:0F:CF?

MAC address prefix 1C:0F:CF is registered to Sypro Optics GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 1C:0F:CF has a network interface built by Sypro Optics GmbH.

What is the OUI 1C:0F:CF?

1C:0F:CF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Sypro Optics GmbH. It covers every address from 1C:0F:CF:00:00:00 to 1C:0F:CF:FF:FF:FF, or 16,777,216 addresses in total. It is also written 1C-0F-CF.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 1C:0F:CF:00:00:00 that is 1C:0F:CF — 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 Sypro Optics GmbH located?

Sypro Optics GmbH is listed at Carl-Zeiss-Promenade 10 Jena Thuringia DE 07745 in the IEEE OUI registry entry for 1C:0F:CF. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Sypro Optics GmbH

MAC address prefix 1C:0F:CF is registered to Sypro Optics GmbH in the IEEE OUI registry. Any device whose MAC address begins with 1C:0F:CF has a network interface built by Sypro Optics GmbH. 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 1C:0F:CF:00:00:00 to 1C:0F:CF:FF:FF:FF.

OUI prefix: 1C:0F:CF
Hyphen form: 1C-0F-CF
MAC range: 1C:0F:CF:00:00:00 – 1C:0F:CF:FF:FF:FF
Addresses in block: 16,777,216
Organization: Sypro Optics GmbH
Address: Carl-Zeiss-Promenade 10 Jena Thuringia DE 07745
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 "Sypro Optics GmbH"
archived source →
2026-07-17Assigned to "Sypro Optics GmbH"

Nearby in the registry

The prefixes assigned immediately before and after 1C:0F:CF:

FAQ

Which company owns MAC address prefix 1C:0F:CF?: MAC address prefix 1C:0F:CF is registered to Sypro Optics GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 1C:0F:CF has a network interface built by Sypro Optics GmbH.
What is the OUI 1C:0F:CF?: 1C:0F:CF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Sypro Optics GmbH. It covers every address from 1C:0F:CF:00:00:00 to 1C:0F:CF:FF:FF:FF, or 16,777,216 addresses in total. It is also written 1C-0F-CF.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 1C:0F:CF:00:00:00 that is 1C:0F:CF — 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 Sypro Optics GmbH located?: Sypro Optics GmbH is listed at Carl-Zeiss-Promenade 10 Jena Thuringia DE 07745 in the IEEE OUI registry entry for 1C:0F:CF. This is the address the organization registered with the IEEE, which may differ from its current operating address.