Which company owns MAC address prefix C4:1E:CE?

MAC address prefix C4:1E:CE is registered to HMI Sources Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C4:1E:CE has a network interface built by HMI Sources Ltd..

What is the OUI C4:1E:CE?

C4:1E:CE is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to HMI Sources Ltd.. It covers every address from C4:1E:CE:00:00:00 to C4:1E:CE:FF:FF:FF, or 16,777,216 addresses in total. It is also written C4-1E-CE.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in C4:1E:CE:00:00:00 that is C4:1E:CE — 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 HMI Sources Ltd. located?

HMI Sources Ltd. is listed at 5 Floor, Suite 2, 233 Hsin Yi Road, Section 4 Taipei TW 10681 in the IEEE OUI registry entry for C4:1E:CE. This is the address the organization registered with the IEEE, which may differ from its current operating address.

HMI Sources Ltd.

MAC address prefix C4:1E:CE is registered to HMI Sources Ltd. in the IEEE OUI registry. Any device whose MAC address begins with C4:1E:CE has a network interface built by HMI Sources 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 C4:1E:CE:00:00:00 to C4:1E:CE:FF:FF:FF.

OUI prefix: C4:1E:CE
Hyphen form: C4-1E-CE
MAC range: C4:1E:CE:00:00:00 – C4:1E:CE:FF:FF:FF
Addresses in block: 16,777,216
Organization: HMI Sources Ltd.
Address: 5 Floor, Suite 2, 233 Hsin Yi Road, Section 4 Taipei TW 10681
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 "HMI Sources Ltd."
archived source →
2026-07-17Assigned to "HMI Sources Ltd."

Nearby in the registry

The prefixes assigned immediately before and after C4:1E:CE:

FAQ

Which company owns MAC address prefix C4:1E:CE?: MAC address prefix C4:1E:CE is registered to HMI Sources Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C4:1E:CE has a network interface built by HMI Sources Ltd..
What is the OUI C4:1E:CE?: C4:1E:CE is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to HMI Sources Ltd.. It covers every address from C4:1E:CE:00:00:00 to C4:1E:CE:FF:FF:FF, or 16,777,216 addresses in total. It is also written C4-1E-CE.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in C4:1E:CE:00:00:00 that is C4:1E:CE — 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 HMI Sources Ltd. located?: HMI Sources Ltd. is listed at 5 Floor, Suite 2, 233 Hsin Yi Road, Section 4 Taipei TW 10681 in the IEEE OUI registry entry for C4:1E:CE. This is the address the organization registered with the IEEE, which may differ from its current operating address.