MA-S: a /36 block (also called an OUI-36 assignment), IEEE's smallest, covering 4,096 addresses.
Prefix8C:1F:64:5F:40:00 /36
Vendor addressBuilding 1-4, No. 9, Yongfu Road, Dafeng Economic Development Zone, Yancheng City Jiangsu CN 224199
Country🇨🇳 China
RegisteredApr 17, 2026
Block range8C:1F:64:5F:40:00– 8C:1F:64:5F:4F:FF
Address capacity4,096
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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8C:1F:64:5F:20:00 /36
CMC Applied Technology institute
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8C:1F:64:5F:50:00 /36
HongSeok Ltd.
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
Jiangsu Yi Rong Mstar Technology Ltd. holds 2 registered blocks in the IEEE registry, ranking #2,326 of 33,421 organizations by block count.
Other blocks registered to Jiangsu Yi Rong Mstar Technology Ltd.