Which company owns MAC address prefix 30:C9:1B?

MAC address prefix 30:C9:1B is registered to Zhen Shi Information Technology（Shanghai）Co.,Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 30:C9:1B has a network interface built by Zhen Shi Information Technology（Shanghai）Co.,Ltd..

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 30:C9:1B:00:00:00 that is 30:C9:1B — 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.

Zhen Shi Information Technology（Shanghai）Co.,Ltd.

MAC address prefix 30:C9:1B is registered to Zhen Shi Information Technology（Shanghai）Co.,Ltd. in the IEEE OUI registry. Any device whose MAC address begins with 30:C9:1B has a network interface built by Zhen Shi Information Technology（Shanghai）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 30:C9:1B:00:00:00 to 30:C9:1B:FF:FF:FF.

OUI prefix: 30:C9:1B
Hyphen form: 30-C9-1B
MAC range: 30:C9:1B:00:00:00 – 30:C9:1B:FF:FF:FF
Addresses in block: 16,777,216
Organization: Zhen Shi Information Technology（Shanghai）Co.,Ltd.
Address: 5F, Building 3?No. 401 Caobao Road, Xuhui District, Shanghai, ChinaShanghai Shanghai CN 200233
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.

2025-05-13Assigned to "Zhen Shi Information Technology（Shanghai）Co.,Ltd."
archived source →
2026-07-17Assigned to "Zhen Shi Information Technology（Shanghai）Co.,Ltd."

Nearby in the registry

The prefixes assigned immediately before and after 30:C9:1B:

FAQ

Which company owns MAC address prefix 30:C9:1B?: MAC address prefix 30:C9:1B is registered to Zhen Shi Information Technology（Shanghai）Co.,Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 30:C9:1B has a network interface built by Zhen Shi Information Technology（Shanghai）Co.,Ltd..
What is the OUI 30:C9:1B?: 30:C9:1B is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Zhen Shi Information Technology（Shanghai）Co.,Ltd.. It covers every address from 30:C9:1B:00:00:00 to 30:C9:1B:FF:FF:FF, or 16,777,216 addresses in total. It is also written 30-C9-1B.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 30:C9:1B:00:00:00 that is 30:C9:1B — 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 Zhen Shi Information Technology（Shanghai）Co.,Ltd. located?: Zhen Shi Information Technology（Shanghai）Co.,Ltd. is listed at 5F, Building 3?No. 401 Caobao Road, Xuhui District, Shanghai, ChinaShanghai Shanghai CN 200233 in the IEEE OUI registry entry for 30:C9:1B. This is the address the organization registered with the IEEE, which may differ from its current operating address.