MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
Prefix44:03:77:90:00:00 /28
Vendor address504, Building B ,Guangming Industrial Park, Zhonghua Road, Minzhi, Longhua District SHENZHEN GUANGDONG CN 518131
Country🇨🇳 China
RegisteredAug 21, 2019
Block range44:03:77:90:00:00– 44:03:77:9F: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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44:03:77:80:00:00 /28
Gemmy Electronics (Shenzhen) Co, Ltd
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44:03:77:A0:00:00 /28
symplr
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
SHENZHEN UT-KING TECHNOLOGY CO.,LTD holds 1 registered blocks in the IEEE registry, ranking #26,978 of 33,427 organizations by block count.