MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
PrefixAC:1D:DF:80:00:00 /28
Vendor addressNo.6,Hongsheng Street MianYang SiChuan CN 621102
Country🇨🇳 China
RegisteredAug 6, 2017
Block rangeAC:1D:DF:80:00:00– AC:1D:DF:8F: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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AC:1D:DF:70:00:00 /28
Green IT Korea Co., Ltd.
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AC:1D:DF:90:00:00 /28
Solare Datensysteme GmbH
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
Sichuan Odot Automation System Co., Ltd. holds 2 registered blocks in the IEEE registry, ranking #3,061 of 33,427 organizations by block count.