Which company owns MAC address prefix 30:65:EC?

MAC address prefix 30:65:EC is registered to Wistron (ChongQing) in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 30:65:EC has a network interface built by Wistron (ChongQing).

What is the OUI 30:65:EC?

30:65:EC is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Wistron (ChongQing). It covers every address from 30:65:EC:00:00:00 to 30:65:EC:FF:FF:FF, or 16,777,216 addresses in total. It is also written 30-65-EC.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 30:65:EC:00:00:00 that is 30:65:EC — 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 Wistron (ChongQing) located?

Wistron (ChongQing) is listed at No.F08/F09,D zone,Konggang Functional Zone ChongQing CN 401120 in the IEEE OUI registry entry for 30:65:EC. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Wistron (ChongQing)

MAC address prefix 30:65:EC is registered to Wistron (ChongQing) in the IEEE OUI registry. Any device whose MAC address begins with 30:65:EC has a network interface built by Wistron (ChongQing). 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 30:65:EC:00:00:00 to 30:65:EC:FF:FF:FF.

OUI prefix: 30:65:EC
Hyphen form: 30-65-EC
MAC range: 30:65:EC:00:00:00 – 30:65:EC:FF:FF:FF
Addresses in block: 16,777,216
Organization: Wistron (ChongQing)
Address: No.F08/F09,D zone,Konggang Functional Zone ChongQing CN 401120
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 "Wistron (ChongQing)"
archived source →
2026-07-17Assigned to "Wistron (ChongQing)"

Nearby in the registry

The prefixes assigned immediately before and after 30:65:EC:

FAQ

Which company owns MAC address prefix 30:65:EC?: MAC address prefix 30:65:EC is registered to Wistron (ChongQing) in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 30:65:EC has a network interface built by Wistron (ChongQing).
What is the OUI 30:65:EC?: 30:65:EC is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Wistron (ChongQing). It covers every address from 30:65:EC:00:00:00 to 30:65:EC:FF:FF:FF, or 16,777,216 addresses in total. It is also written 30-65-EC.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 30:65:EC:00:00:00 that is 30:65:EC — 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 Wistron (ChongQing) located?: Wistron (ChongQing) is listed at No.F08/F09,D zone,Konggang Functional Zone ChongQing CN 401120 in the IEEE OUI registry entry for 30:65:EC. This is the address the organization registered with the IEEE, which may differ from its current operating address.