Which company owns MAC address prefix 68:1D:EF?

MAC address prefix 68:1D:EF is registered to Shenzhen CYX Technology Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 68:1D:EF has a network interface built by Shenzhen CYX Technology Co., Ltd..

What is the OUI 68:1D:EF?

68:1D:EF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Shenzhen CYX Technology Co., Ltd.. It covers every address from 68:1D:EF:00:00:00 to 68:1D:EF:FF:FF:FF, or 16,777,216 addresses in total. It is also written 68-1D-EF.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 68:1D:EF:00:00:00 that is 68:1D:EF — 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 Shenzhen CYX Technology Co., Ltd. located?

Shenzhen CYX Technology Co., Ltd. is listed at 2/F, Bldg. 6, Guangxi Industrial Park, Jianshe Rd., Longhua New Dist., Shenzhen Shenzhen CN 518109 in the IEEE OUI registry entry for 68:1D:EF. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Shenzhen CYX Technology Co., Ltd.

MAC address prefix 68:1D:EF is registered to Shenzhen CYX Technology Co., Ltd. in the IEEE OUI registry. Any device whose MAC address begins with 68:1D:EF has a network interface built by Shenzhen CYX Technology 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 68:1D:EF:00:00:00 to 68:1D:EF:FF:FF:FF.

OUI prefix: 68:1D:EF
Hyphen form: 68-1D-EF
MAC range: 68:1D:EF:00:00:00 – 68:1D:EF:FF:FF:FF
Addresses in block: 16,777,216
Organization: Shenzhen CYX Technology Co., Ltd.
Address: 2/F, Bldg. 6, Guangxi Industrial Park, Jianshe Rd., Longhua New Dist., Shenzhen Shenzhen CN 518109
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.

2017-09-08Assigned to "Shenzhen CYX Technology Co., Ltd."
archived source →
2026-07-17Assigned to "Shenzhen CYX Technology Co., Ltd."

Nearby in the registry

The prefixes assigned immediately before and after 68:1D:EF:

FAQ

Which company owns MAC address prefix 68:1D:EF?: MAC address prefix 68:1D:EF is registered to Shenzhen CYX Technology Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 68:1D:EF has a network interface built by Shenzhen CYX Technology Co., Ltd..
What is the OUI 68:1D:EF?: 68:1D:EF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Shenzhen CYX Technology Co., Ltd.. It covers every address from 68:1D:EF:00:00:00 to 68:1D:EF:FF:FF:FF, or 16,777,216 addresses in total. It is also written 68-1D-EF.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 68:1D:EF:00:00:00 that is 68:1D:EF — 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 Shenzhen CYX Technology Co., Ltd. located?: Shenzhen CYX Technology Co., Ltd. is listed at 2/F, Bldg. 6, Guangxi Industrial Park, Jianshe Rd., Longhua New Dist., Shenzhen Shenzhen CN 518109 in the IEEE OUI registry entry for 68:1D:EF. This is the address the organization registered with the IEEE, which may differ from its current operating address.