Shenzhen Jiuzhou Electric Co.,LTD MAC Prefix Identification

A MAC address beginning with B4:CF:DB or 5C:94:62 matches an IEEE MA-L assignment to Shenzhen Jiuzhou Electric Co.,LTD; the prefix alone does not identify a device category. The IEEE records list two assignments to that exact legal name. The company profile describes Shenzhen Jiuzhou Electric Co., Ltd. as established in July 2001 and focused on digital video broadcasting (DVB) and Internet of Things (IoT) businesses.

It describes digital TV products, IoT gateways, and terminal receiving equipment, but does not map any of them to these prefixes.

Both assignments are 24-bit prefixes in 48-bit MAC addresses, leaving 24 suffix bits and 16,777,216 possible suffix values per prefix. That is a mathematical address-space size, not a count of devices or shipments. RFC 7042 states that assigned OUIs and longer MAC prefixes have the Local bit set to zero and the Group bit unspecified. The first octets B4 and 5C both have their two lowest bits set to zero.

A change to either bit produces a different prefix; neither bit varies within an exact match. A prefix match establishes the registry assignment only, not a device, product, operator, or security state.

The supplied IEEE CSV records do not include assignment dates. The company profile reports more than 70 million digital set-top boxes sold as of the end of 2017 and names China Mobile, China Telecom, and Lvmi in connection with IoT product cooperation; neither fact connects a product or partner to these MAC prefixes.

Device category

Unknown; the company profile does not map a device category to either prefix [Unknown] — https://en.szjiuzhou.com.cn/gsjj.html

Company

Shenzhen Jiuzhou Electric Co.,LTD [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv

Prefixes

B4:CF:DB and 5C:94:62 [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv

Registry

MA-L [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv

Device types

Unknown [Unknown] — https://en.szjiuzhou.com.cn/gsjj.html

Industry

Digital video broadcasting and Internet of Things [Confirmed] — https://en.szjiuzhou.com.cn/gsjj.html

Notable products

Digital TV products; IoT intelligent gateway; terminal receiving equipment; video storage and analysis platform solutions [Confirmed] — https://en.szjiuzhou.com.cn/gsjj.html

Related vendors

Unknown [Unknown] — https://en.szjiuzhou.com.cn/gsjj.html

Website

https://en.szjiuzhou.com.cn/gsjj.html [Confirmed] — https://en.szjiuzhou.com.cn/gsjj.html

Assignment dates

Assignment dates are unavailable in these IEEE CSV records. [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv