Which company owns MAC address prefix C4:8A:5A?

MAC address prefix C4:8A:5A is registered to JFCONTROL in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C4:8A:5A has a network interface built by JFCONTROL.

What is the OUI C4:8A:5A?

C4:8A:5A is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to JFCONTROL. It covers every address from C4:8A:5A:00:00:00 to C4:8A:5A:FF:FF:FF, or 16,777,216 addresses in total. It is also written C4-8A-5A.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in C4:8A:5A:00:00:00 that is C4:8A:5A — 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 JFCONTROL located?

JFCONTROL is listed at 1449-37 Seoburo Suwon Gyunggi-do KR 16643 in the IEEE OUI registry entry for C4:8A:5A. This is the address the organization registered with the IEEE, which may differ from its current operating address.

JFCONTROL

MAC address prefix C4:8A:5A is registered to JFCONTROL in the IEEE OUI registry. Any device whose MAC address begins with C4:8A:5A has a network interface built by JFCONTROL. 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 C4:8A:5A:00:00:00 to C4:8A:5A:FF:FF:FF.

OUI prefix: C4:8A:5A
Hyphen form: C4-8A-5A
MAC range: C4:8A:5A:00:00:00 – C4:8A:5A:FF:FF:FF
Addresses in block: 16,777,216
Organization: JFCONTROL
Address: 1449-37 Seoburo Suwon Gyunggi-do KR 16643
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.

2019-07-04Assigned to "JFCONTROL"
archived source →
2026-07-17Assigned to "JFCONTROL"

Nearby in the registry

The prefixes assigned immediately before and after C4:8A:5A:

FAQ

Which company owns MAC address prefix C4:8A:5A?: MAC address prefix C4:8A:5A is registered to JFCONTROL in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C4:8A:5A has a network interface built by JFCONTROL.
What is the OUI C4:8A:5A?: C4:8A:5A is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to JFCONTROL. It covers every address from C4:8A:5A:00:00:00 to C4:8A:5A:FF:FF:FF, or 16,777,216 addresses in total. It is also written C4-8A-5A.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in C4:8A:5A:00:00:00 that is C4:8A:5A — 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 JFCONTROL located?: JFCONTROL is listed at 1449-37 Seoburo Suwon Gyunggi-do KR 16643 in the IEEE OUI registry entry for C4:8A:5A. This is the address the organization registered with the IEEE, which may differ from its current operating address.