MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
Prefix30:BB:28:30:00:00 /28
Vendor address3rd Floor, Building 1, No.3560, Waiqingsong Road,Baihe Town, Qingpu District,Shanghai Shanghai Shanghai CN 201701
Country🇨🇳 China
RegisteredAug 13, 2026
Block range30:BB:28:30:00:00– 30:BB:28:3F: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
Where this block sits
Previous
30:BB:28:20:00:00 /28
ROOMIO LIMITED
Next
30:BB:28:40:00:00 /28
HUIZHOU HENGDU ELECTRONICS CO.,LTD.
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
Cellslink Intelligence Technology Co,Ltd holds 1 registered blocks in the IEEE registry, ranking #8,014 of 33,427 organizations by block count.