MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
Prefix38:3A:21:20:00:00 /28
Vendor address6F, Bld#A, Dezhong Industrial Park, Yangmei Village, Bantian Town, Longgang District Shenzhen Guangdong CN 518129
Country🇨🇳 China
RegisteredJul 3, 2016
Block range38:3A:21:20:00:00– 38:3A:21:2F: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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38:3A:21:10:00:00 /28
HOBART GmbH
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38:3A:21:30:00:00 /28
Shanghai Greatwall Safety System Co.,Ltd
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
Shenzhen HS Fiber Communication Equipment CO., LTD holds 2 registered blocks in the IEEE registry, ranking #3,000 of 33,427 organizations by block count.
Other blocks registered to Shenzhen HS Fiber Communication Equipment CO., LTD