Which company owns MAC address prefix 4C:AD:DF?

MAC address prefix 4C:AD:DF is registered to Công ty Cổ phần Thiết bị Công nghiệp GEIC in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 4C:AD:DF has a network interface built by Công ty Cổ phần Thiết bị Công nghiệp GEIC.

What is the OUI 4C:AD:DF?

4C:AD:DF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Công ty Cổ phần Thiết bị Công nghiệp GEIC. It covers every address from 4C:AD:DF:00:00:00 to 4C:AD:DF:FF:FF:FF, or 16,777,216 addresses in total. It is also written 4C-AD-DF.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 4C:AD:DF:00:00:00 that is 4C:AD:DF — 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 Công ty Cổ phần Thiết bị Công nghiệp GEIC located?

Công ty Cổ phần Thiết bị Công nghiệp GEIC is listed at 52 Lê Đại Hành, phường Lê Đại Hành, quận Hai Bà Trưng Thành phố Hà Nội VN 000084 in the IEEE OUI registry entry for 4C:AD:DF. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Công ty Cổ phần Thiết bị Công nghiệp GEIC

MAC address prefix 4C:AD:DF is registered to Công ty Cổ phần Thiết bị Công nghiệp GEIC in the IEEE OUI registry. Any device whose MAC address begins with 4C:AD:DF has a network interface built by Công ty Cổ phần Thiết bị Công nghiệp GEIC. 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 4C:AD:DF:00:00:00 to 4C:AD:DF:FF:FF:FF.

OUI prefix: 4C:AD:DF
Hyphen form: 4C-AD-DF
MAC range: 4C:AD:DF:00:00:00 – 4C:AD:DF:FF:FF:FF
Addresses in block: 16,777,216
Organization: Công ty Cổ phần Thiết bị Công nghiệp GEIC
Address: 52 Lê Đại Hành, phường Lê Đại Hành, quận Hai Bà Trưng Thành phố Hà Nội VN 000084
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.

2025-08-23Assigned to "Công ty Cổ phần Thiết bị Công nghiệp GEIC"
archived source →
2026-07-17Assigned to "Công ty Cổ phần Thiết bị Công nghiệp GEIC"

Nearby in the registry

The prefixes assigned immediately before and after 4C:AD:DF:

FAQ

Which company owns MAC address prefix 4C:AD:DF?: MAC address prefix 4C:AD:DF is registered to Công ty Cổ phần Thiết bị Công nghiệp GEIC in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 4C:AD:DF has a network interface built by Công ty Cổ phần Thiết bị Công nghiệp GEIC.
What is the OUI 4C:AD:DF?: 4C:AD:DF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Công ty Cổ phần Thiết bị Công nghiệp GEIC. It covers every address from 4C:AD:DF:00:00:00 to 4C:AD:DF:FF:FF:FF, or 16,777,216 addresses in total. It is also written 4C-AD-DF.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 4C:AD:DF:00:00:00 that is 4C:AD:DF — 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 Công ty Cổ phần Thiết bị Công nghiệp GEIC located?: Công ty Cổ phần Thiết bị Công nghiệp GEIC is listed at 52 Lê Đại Hành, phường Lê Đại Hành, quận Hai Bà Trưng Thành phố Hà Nội VN 000084 in the IEEE OUI registry entry for 4C:AD:DF. This is the address the organization registered with the IEEE, which may differ from its current operating address.