Which company owns MAC address prefix C4:79:81?

MAC address prefix C4:79:81 is registered to Ehya LTD in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C4:79:81 has a network interface built by Ehya LTD.

What is the OUI C4:79:81?

C4:79:81 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Ehya LTD. It covers every address from C4:79:81:00:00:00 to C4:79:81:FF:FF:FF, or 16,777,216 addresses in total. It is also written C4-79-81.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in C4:79:81:00:00:00 that is C4:79:81 — 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 Ehya LTD located?

Ehya LTD is listed at 2570 Al Khalij Rd - Ash Shati Al Gharbi Dist. Unit Number 11 Dammam SA 32413 in the IEEE OUI registry entry for C4:79:81. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Ehya LTD

MAC address prefix C4:79:81 is registered to Ehya LTD in the IEEE OUI registry. Any device whose MAC address begins with C4:79:81 has a network interface built by Ehya 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 C4:79:81:00:00:00 to C4:79:81:FF:FF:FF.

OUI prefix: C4:79:81
Hyphen form: C4-79-81
MAC range: C4:79:81:00:00:00 – C4:79:81:FF:FF:FF
Addresses in block: 16,777,216
Organization: Ehya LTD
Address: 2570 Al Khalij Rd - Ash Shati Al Gharbi Dist. Unit Number 11 Dammam SA 32413
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.

2025-02-27Assigned to "Ehya LTD"
archived source →
2026-07-17Assigned to "Ehya LTD"

Nearby in the registry

The prefixes assigned immediately before and after C4:79:81:

FAQ

Which company owns MAC address prefix C4:79:81?: MAC address prefix C4:79:81 is registered to Ehya LTD in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C4:79:81 has a network interface built by Ehya LTD.
What is the OUI C4:79:81?: C4:79:81 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Ehya LTD. It covers every address from C4:79:81:00:00:00 to C4:79:81:FF:FF:FF, or 16,777,216 addresses in total. It is also written C4-79-81.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in C4:79:81:00:00:00 that is C4:79:81 — 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 Ehya LTD located?: Ehya LTD is listed at 2570 Al Khalij Rd - Ash Shati Al Gharbi Dist. Unit Number 11 Dammam SA 32413 in the IEEE OUI registry entry for C4:79:81. This is the address the organization registered with the IEEE, which may differ from its current operating address.