MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
Prefix0C:BF:B4:C0:00:00 /28
Vendor addressRoom 1001, C Building,Tsinghua UNIS information port,langshan Road 13, Nanshan District, Shenzhen,Guangdong,China ShenZhen Guangdong CN 518057
Country🇨🇳 China
RegisteredOct 25, 2025
Block range0C:BF:B4:C0:00:00– 0C:BF:B4:CF: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
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0C:BF:B4:D0:00:00 /28
Nanchang si colordisplay Technology Co.,Ltd
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
ShenZhen Zeal-All Technology Co.,Ltd holds 1 registered blocks in the IEEE registry, ranking #27,098 of 33,427 organizations by block count.