Which company owns MAC address prefix 9C:DD:1F?

MAC address prefix 9C:DD:1F is registered to Intelligent Steward Co.,Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 9C:DD:1F has a network interface built by Intelligent Steward Co.,Ltd.

What is the OUI 9C:DD:1F?

9C:DD:1F is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Intelligent Steward Co.,Ltd. It covers every address from 9C:DD:1F:00:00:00 to 9C:DD:1F:FF:FF:FF, or 16,777,216 addresses in total. It is also written 9C-DD-1F.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 9C:DD:1F:00:00:00 that is 9C:DD:1F — 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 Intelligent Steward Co.,Ltd located?

Intelligent Steward Co.,Ltd is listed at Room 508-598 XiTianGeZhuang Town Government Office Building,8# XiTong Road ,Economic Development District ,MiYun County ,BeiJing City BeiJing City CN 101509 in the IEEE OUI registry entry for 9C:DD:1F. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Intelligent Steward Co.,Ltd

MAC address prefix 9C:DD:1F is registered to Intelligent Steward Co.,Ltd in the IEEE OUI registry. Any device whose MAC address begins with 9C:DD:1F has a network interface built by Intelligent Steward 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:DD:1F:00:00:00 to 9C:DD:1F:FF:FF:FF.

OUI prefix: 9C:DD:1F
Hyphen form: 9C-DD-1F
MAC range: 9C:DD:1F:00:00:00 – 9C:DD:1F:FF:FF:FF
Addresses in block: 16,777,216
Organization: Intelligent Steward Co.,Ltd
Address: Room 508-598 XiTianGeZhuang Town Government Office Building,8# XiTong Road ,Economic Development District ,MiYun County ,BeiJing City BeiJing City CN 101509
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 "Intelligent Steward Co.,Ltd"
archived source →
2026-07-17Assigned to "Intelligent Steward Co.,Ltd"

Nearby in the registry

The prefixes assigned immediately before and after 9C:DD:1F:

FAQ

Which company owns MAC address prefix 9C:DD:1F?: MAC address prefix 9C:DD:1F is registered to Intelligent Steward Co.,Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 9C:DD:1F has a network interface built by Intelligent Steward Co.,Ltd.
What is the OUI 9C:DD:1F?: 9C:DD:1F is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Intelligent Steward Co.,Ltd. It covers every address from 9C:DD:1F:00:00:00 to 9C:DD:1F:FF:FF:FF, or 16,777,216 addresses in total. It is also written 9C-DD-1F.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 9C:DD:1F:00:00:00 that is 9C:DD:1F — 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 Intelligent Steward Co.,Ltd located?: Intelligent Steward Co.,Ltd is listed at Room 508-598 XiTianGeZhuang Town Government Office Building,8# XiTong Road ,Economic Development District ,MiYun County ,BeiJing City BeiJing City CN 101509 in the IEEE OUI registry entry for 9C:DD:1F. This is the address the organization registered with the IEEE, which may differ from its current operating address.