Which company owns MAC address prefix 9C:E7:BD?

MAC address prefix 9C:E7:BD is registered to Winduskorea co., Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 9C:E7:BD has a network interface built by Winduskorea co., Ltd.

What is the OUI 9C:E7:BD?

9C:E7:BD is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Winduskorea co., Ltd. It covers every address from 9C:E7:BD:00:00:00 to 9C:E7:BD:FF:FF:FF, or 16,777,216 addresses in total. It is also written 9C-E7-BD.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 9C:E7:BD:00:00:00 that is 9C:E7:BD — 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 Winduskorea co., Ltd located?

Winduskorea co., Ltd is listed at RM313, Seoul-Garden Bldg, Seoul KR 152-828 in the IEEE OUI registry entry for 9C:E7:BD. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Winduskorea co., Ltd

MAC address prefix 9C:E7:BD is registered to Winduskorea co., Ltd in the IEEE OUI registry. Any device whose MAC address begins with 9C:E7:BD has a network interface built by Winduskorea co., 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 9C:E7:BD:00:00:00 to 9C:E7:BD:FF:FF:FF.

OUI prefix: 9C:E7:BD
Hyphen form: 9C-E7-BD
MAC range: 9C:E7:BD:00:00:00 – 9C:E7:BD:FF:FF:FF
Addresses in block: 16,777,216
Organization: Winduskorea co., Ltd
Address: RM313, Seoul-Garden Bldg, Seoul KR 152-828
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 "Winduskorea co., Ltd"
archived source →
2026-07-17Assigned to "Winduskorea co., Ltd"

Nearby in the registry

The prefixes assigned immediately before and after 9C:E7:BD:

FAQ

Which company owns MAC address prefix 9C:E7:BD?: MAC address prefix 9C:E7:BD is registered to Winduskorea co., Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 9C:E7:BD has a network interface built by Winduskorea co., Ltd.
What is the OUI 9C:E7:BD?: 9C:E7:BD is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Winduskorea co., Ltd. It covers every address from 9C:E7:BD:00:00:00 to 9C:E7:BD:FF:FF:FF, or 16,777,216 addresses in total. It is also written 9C-E7-BD.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 9C:E7:BD:00:00:00 that is 9C:E7:BD — 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 Winduskorea co., Ltd located?: Winduskorea co., Ltd is listed at RM313, Seoul-Garden Bldg, Seoul KR 152-828 in the IEEE OUI registry entry for 9C:E7:BD. This is the address the organization registered with the IEEE, which may differ from its current operating address.