MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
Prefix18:45:B3:20:00:00 /28
Vendor addressRoom c1-201, No. 127, huizhiqiao Road, high tech Zone Qingdao Shandong CN 266114
Country🇨🇳 China
RegisteredSep 30, 2021
Block range18:45:B3:20:00:00– 18:45:B3:2F: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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18:45:B3:10:00:00 /28
Pfannenberg GmbH
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18:45:B3:30:00:00 /28
Ancsonic (chongqing) Electronic Science& Technology Co.,Ltd
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
Haier cloud Health Technology (Qingdao) Co., Ltd holds 1 registered blocks in the IEEE registry, ranking #14,303 of 33,421 organizations by block count.