Shenzhen Huizhen Fishery Co., Ltd.

MA-M

MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.

PrefixB4:DF:43:40:00:00 /28

Vendor addressRoom 2101, 21th Floor, Bldg 8, Qianhai Kexing Technology Park, Jinhai Road, Xixiang, Baoan, Shenzhen CN 518000

Country🇨🇳 China

RegisteredJul 29, 2026

Block rangeB4:DF:43:40:00:00– B4:DF:43:4F:FF:FF

Address capacity1,048,576

AdministrationUniversally administered: its prefix comes from a block registered through the IEEE Registration Authority

TransmissionUnicast: addressed to a single device

SourceIEEE Registration Authority

Address capacity is the size of this registered block, not a count of devices actually manufactured or online. Registration identifies the organization holding the block, not a specific device model or unit.

Curious how a prefix like this turns into a full address? See how MAC addresses are structured →

Example addresses in this block

B4:DF:43:40:00:00 B4:DF:43:47:FF:FF B4:DF:43:4F:FF:FF

Where this block sits

Previous B4:DF:43:30:00:00 /28 Hangzhou Huasu Technology CO., LTD. Next B4:DF:43:50:00:00 /28 Guangdong Enok Communication CO.,Ltd.

The nearest registered blocks of the same size on either side of this one in IEEE's address space.

Shenzhen Huizhen Fishery Co., Ltd. holds 1 registered blocks in the IEEE registry, ranking #26,565 of 33,427 organizations by block count.