MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
Prefix64:31:39:40:00:00 /28
Vendor addressYokohama Mitsui Bldg.12F, 1-1-2 Takashima, Nishi-ku Yokohama Kanagawa JP 220-0011
Country🇯🇵 Japan
RegisteredSep 26, 2019
Block range64:31:39:40:00:00– 64:31:39:4F: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.
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Example addresses in this block
Where this block sits
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64:31:39:30:00:00 /28
KOANGYOW INTEGRATION MACHINE CO., LTD.
Next
64:31:39:50:00:00 /28
Shenzhen He&e Technology Co.,Ltd.
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
Active Brains holds 3 registered blocks in the IEEE registry, ranking #898 of 33,421 organizations by block count.
Other blocks registered to Active Brains