Which company owns MAC address prefix 78:07:1C?

MAC address prefix 78:07:1C is registered to Green Energy Options Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 78:07:1C has a network interface built by Green Energy Options Ltd.

What is the OUI 78:07:1C?

78:07:1C is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Green Energy Options Ltd. It covers every address from 78:07:1C:00:00:00 to 78:07:1C:FF:FF:FF, or 16,777,216 addresses in total. It is also written 78-07-1C.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 78:07:1C:00:00:00 that is 78:07:1C — 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 Green Energy Options Ltd located?

Green Energy Options Ltd is listed at 3 St. Mary's Court, Main Street Cambridge Cambridgeshire GB CB23 7QS in the IEEE OUI registry entry for 78:07:1C. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does Green Energy Options Ltd own?

Green Energy Options Ltd holds 2 OUI prefixes in the IEEE registry, of which 78:07:1C is one. A device made by Green Energy Options Ltd could carry a MAC address from any of them.

Green Energy Options Ltd

MAC address prefix 78:07:1C is registered to Green Energy Options Ltd in the IEEE OUI registry. Any device whose MAC address begins with 78:07:1C has a network interface built by Green Energy Options 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 78:07:1C:00:00:00 to 78:07:1C:FF:FF:FF.

OUI prefix: 78:07:1C
Hyphen form: 78-07-1C
MAC range: 78:07:1C:00:00:00 – 78:07:1C:FF:FF:FF
Addresses in block: 16,777,216
Organization: Green Energy Options Ltd
Address: 3 St. Mary's Court, Main Street Cambridge Cambridgeshire GB CB23 7QS
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.

Other prefixes from Green Energy Options Ltd

Green Energy Options Ltd holds 2 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

BC:6E:76

Assignment history (2)

The IEEE registry publishes current state only — this is the change record we've kept since we started tracking it daily.

2023-07-11Assigned to "Green Energy Options Ltd"
archived source →
2026-07-17Assigned to "Green Energy Options Ltd"

Nearby in the registry

The prefixes assigned immediately before and after 78:07:1C:

FAQ

Which company owns MAC address prefix 78:07:1C?: MAC address prefix 78:07:1C is registered to Green Energy Options Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 78:07:1C has a network interface built by Green Energy Options Ltd.
What is the OUI 78:07:1C?: 78:07:1C is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Green Energy Options Ltd. It covers every address from 78:07:1C:00:00:00 to 78:07:1C:FF:FF:FF, or 16,777,216 addresses in total. It is also written 78-07-1C.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 78:07:1C:00:00:00 that is 78:07:1C — 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 Green Energy Options Ltd located?: Green Energy Options Ltd is listed at 3 St. Mary's Court, Main Street Cambridge Cambridgeshire GB CB23 7QS in the IEEE OUI registry entry for 78:07:1C. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does Green Energy Options Ltd own?: Green Energy Options Ltd holds 2 OUI prefixes in the IEEE registry, of which 78:07:1C is one. A device made by Green Energy Options Ltd could carry a MAC address from any of them.