MA-S: a /36 block (also called an OUI-36 assignment), IEEE's smallest, covering 4,096 addresses.
Prefix8C:1F:64:5F:20:00 /36
Vendor addressCMC Tower, Duy Tan street, Cau Giay Ward, Hanoi Vietnam Hanoi VN 151831
Country🇻🇳 Vietnam
RegisteredJan 3, 2026
Block range8C:1F:64:5F:20:00– 8C:1F:64:5F:2F: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
Previous
8C:1F:64:5F:10:00 /36
HD Link Co., Ltd.
Next
8C:1F:64:5F:40:00 /36
Jiangsu Yi Rong Mstar Technology Ltd.
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
CMC Applied Technology institute holds 1 registered blocks in the IEEE registry, ranking #8,648 of 33,421 organizations by block count.