MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
PrefixD4:7C:44:A0:00:00 /28
Vendor addressRm 202, Blk C, Huahan Innovation Park, No.16 Langshan Rd,Nanshan District Shenzhen GuangDong CN 518057
Country🇨🇳 China
RegisteredMar 18, 2018
Block rangeD4:7C:44:A0:00:00– D4:7C:44:AF: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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D4:7C:44:90:00:00 /28
Suzhou Wan Dian Zhang Network Technology Co., Ltd
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D4:7C:44:B0:00:00 /28
OPTiM Corporation
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
Tendzone International Pte Ltd holds 1 registered blocks in the IEEE registry, ranking #29,706 of 33,427 organizations by block count.