Which company owns MAC address prefix B0:C8:3F?

MAC address prefix B0:C8:3F is registered to Jiangsu Cynray IOT Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B0:C8:3F has a network interface built by Jiangsu Cynray IOT Co., Ltd..

What is the OUI B0:C8:3F?

B0:C8:3F is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Jiangsu Cynray IOT Co., Ltd.. It covers every address from B0:C8:3F:00:00:00 to B0:C8:3F:FF:FF:FF, or 16,777,216 addresses in total. It is also written B0-C8-3F.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in B0:C8:3F:00:00:00 that is B0:C8:3F — 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 Jiangsu Cynray IOT Co., Ltd. located?

Jiangsu Cynray IOT Co., Ltd. is listed at Building D1, 1 Zidong road, Qixia district Nanjing Jiangsu CN 210000 in the IEEE OUI registry entry for B0:C8:3F. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Jiangsu Cynray IOT Co., Ltd.

MAC address prefix B0:C8:3F is registered to Jiangsu Cynray IOT Co., Ltd. in the IEEE OUI registry. Any device whose MAC address begins with B0:C8:3F has a network interface built by Jiangsu Cynray IOT 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 B0:C8:3F:00:00:00 to B0:C8:3F:FF:FF:FF.

OUI prefix: B0:C8:3F
Hyphen form: B0-C8-3F
MAC range: B0:C8:3F:00:00:00 – B0:C8:3F:FF:FF:FF
Addresses in block: 16,777,216
Organization: Jiangsu Cynray IOT Co., Ltd.
Address: Building D1, 1 Zidong road, Qixia district Nanjing Jiangsu CN 210000
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 "Jiangsu Cynray IOT Co., Ltd."
archived source →
2026-07-17Assigned to "Jiangsu Cynray IOT Co., Ltd."

Nearby in the registry

The prefixes assigned immediately before and after B0:C8:3F:

FAQ

Which company owns MAC address prefix B0:C8:3F?: MAC address prefix B0:C8:3F is registered to Jiangsu Cynray IOT Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B0:C8:3F has a network interface built by Jiangsu Cynray IOT Co., Ltd..
What is the OUI B0:C8:3F?: B0:C8:3F is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Jiangsu Cynray IOT Co., Ltd.. It covers every address from B0:C8:3F:00:00:00 to B0:C8:3F:FF:FF:FF, or 16,777,216 addresses in total. It is also written B0-C8-3F.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in B0:C8:3F:00:00:00 that is B0:C8:3F — 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 Jiangsu Cynray IOT Co., Ltd. located?: Jiangsu Cynray IOT Co., Ltd. is listed at Building D1, 1 Zidong road, Qixia district Nanjing Jiangsu CN 210000 in the IEEE OUI registry entry for B0:C8:3F. This is the address the organization registered with the IEEE, which may differ from its current operating address.