Which company owns MAC address prefix C4:7F:51?

MAC address prefix C4:7F:51 is registered to Inventek Systems in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C4:7F:51 has a network interface built by Inventek Systems.

What is the OUI C4:7F:51?

C4:7F:51 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Inventek Systems. It covers every address from C4:7F:51:00:00:00 to C4:7F:51:FF:FF:FF, or 16,777,216 addresses in total. It is also written C4-7F-51.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in C4:7F:51:00:00:00 that is C4:7F:51 — 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 Inventek Systems located?

Inventek Systems is listed at 2 Republic Road Billerica Ma US 01862 in the IEEE OUI registry entry for C4:7F:51. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Inventek Systems

MAC address prefix C4:7F:51 is registered to Inventek Systems in the IEEE OUI registry. Any device whose MAC address begins with C4:7F:51 has a network interface built by Inventek Systems. 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 C4:7F:51:00:00:00 to C4:7F:51:FF:FF:FF.

OUI prefix: C4:7F:51
Hyphen form: C4-7F-51
MAC range: C4:7F:51:00:00:00 – C4:7F:51:FF:FF:FF
Addresses in block: 16,777,216
Organization: Inventek Systems
Address: 2 Republic Road Billerica Ma US 01862
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 "Inventek Systems"
archived source →
2026-07-17Assigned to "Inventek Systems"

Nearby in the registry

The prefixes assigned immediately before and after C4:7F:51:

FAQ

Which company owns MAC address prefix C4:7F:51?: MAC address prefix C4:7F:51 is registered to Inventek Systems in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C4:7F:51 has a network interface built by Inventek Systems.
What is the OUI C4:7F:51?: C4:7F:51 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Inventek Systems. It covers every address from C4:7F:51:00:00:00 to C4:7F:51:FF:FF:FF, or 16,777,216 addresses in total. It is also written C4-7F-51.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in C4:7F:51:00:00:00 that is C4:7F:51 — 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 Inventek Systems located?: Inventek Systems is listed at 2 Republic Road Billerica Ma US 01862 in the IEEE OUI registry entry for C4:7F:51. This is the address the organization registered with the IEEE, which may differ from its current operating address.