Which company owns MAC address prefix FC:7F:56?

MAC address prefix FC:7F:56 is registered to CoSyst Control Systems GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with FC:7F:56 has a network interface built by CoSyst Control Systems GmbH.

What is the OUI FC:7F:56?

FC:7F:56 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to CoSyst Control Systems GmbH. It covers every address from FC:7F:56:00:00:00 to FC:7F:56:FF:FF:FF, or 16,777,216 addresses in total. It is also written FC-7F-56.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in FC:7F:56:00:00:00 that is FC:7F:56 — 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 CoSyst Control Systems GmbH located?

CoSyst Control Systems GmbH is listed at Martin-Albert-Str. 1 Nürnberg Bayern DE 90491 in the IEEE OUI registry entry for FC:7F:56. This is the address the organization registered with the IEEE, which may differ from its current operating address.

CoSyst Control Systems GmbH

MAC address prefix FC:7F:56 is registered to CoSyst Control Systems GmbH in the IEEE OUI registry. Any device whose MAC address begins with FC:7F:56 has a network interface built by CoSyst Control Systems 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 FC:7F:56:00:00:00 to FC:7F:56:FF:FF:FF.

OUI prefix: FC:7F:56
Hyphen form: FC-7F-56
MAC range: FC:7F:56:00:00:00 – FC:7F:56:FF:FF:FF
Addresses in block: 16,777,216
Organization: CoSyst Control Systems GmbH
Address: Martin-Albert-Str. 1 Nürnberg Bayern DE 90491
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.

2017-09-08Assigned to "CoSyst Control Systems GmbH"
archived source →
2026-07-17Assigned to "CoSyst Control Systems GmbH"

Nearby in the registry

The prefixes assigned immediately before and after FC:7F:56:

FAQ

Which company owns MAC address prefix FC:7F:56?: MAC address prefix FC:7F:56 is registered to CoSyst Control Systems GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with FC:7F:56 has a network interface built by CoSyst Control Systems GmbH.
What is the OUI FC:7F:56?: FC:7F:56 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to CoSyst Control Systems GmbH. It covers every address from FC:7F:56:00:00:00 to FC:7F:56:FF:FF:FF, or 16,777,216 addresses in total. It is also written FC-7F-56.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in FC:7F:56:00:00:00 that is FC:7F:56 — 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 CoSyst Control Systems GmbH located?: CoSyst Control Systems GmbH is listed at Martin-Albert-Str. 1 Nürnberg Bayern DE 90491 in the IEEE OUI registry entry for FC:7F:56. This is the address the organization registered with the IEEE, which may differ from its current operating address.