MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
PrefixA0:19:B2:20:00:00 /28
Vendor address7F Building D, Tsinghua Tongfang High-Tech PlazaRoom 1706, Building D-East, Tsinghua Tongfang High-Tech Plaza Haidian District, Beijing, 100083, China BEIJING HAIDIAN CN 100083
Country🇨🇳 China
RegisteredMar 4, 2018
Block rangeA0:19:B2:20:00:00– A0:19:B2:2F: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
Previous
A0:19:B2:10:00:00 /28
El Sewedy Electrometer Egypt S.A.E.
Next
A0:19:B2:30:00:00 /28
Power Diagnostic Service Co., LTD.
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
Beijing Deephi Intelligent Technology Co., Ltd holds 1 registered blocks in the IEEE registry, ranking #6,521 of 33,427 organizations by block count.