MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
Prefix18:C3:F4:C0:00:00 /28
Vendor addressRoom107, Building 2, No.600, 21 Street, ETDA, HANGZHOU Zhejiang CN 310018
Country🇨🇳 China
RegisteredJun 1, 2022
Block range18:C3:F4:C0:00:00– 18:C3:F4: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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18:C3:F4:B0:00:00 /28
VECTOR TECHNOLOGIES, LLC
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18:C3:F4:D0:00:00 /28
Shanghai Kanghai Information System CO.,LTD.
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
HANGZHOU ZHONGKEJIGUANG TECHNOLOGY CO., LTD holds 1 registered blocks in the IEEE registry, ranking #14,495 of 33,421 organizations by block count.