MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
PrefixA0:28:33:30:00:00 /28
Vendor addressET SPACE, ZIZHU PARK, NO.555, DONGCHUAN RD. SHANGHAI SHANGHAI CN 200241
Country🇨🇳 China
RegisteredJun 3, 2018
Block rangeA0:28:33:30:00:00– A0:28:33:3F: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
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A0:28:33:20:00:00 /28
Shanghai Nohmi Secom Fire Protection Equipment Co.,Ltd.
Next
A0:28:33:40:00:00 /28
Firm INFORMTEST Ltd.
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
SHANGHAI XUNTAI INFORMATION TECHNOLOGY CO.,LTD. holds 1 registered blocks in the IEEE registry, ranking #26,099 of 33,427 organizations by block count.