MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
Prefix04:EC:A9:70:00:00 /28
Vendor address500 Akahama Soja-shi Okayama JP 719-1121
Country🇯🇵 Japan
RegisteredAug 23, 2026
Block range04:EC:A9:70:00:00– 04:EC:A9:7F: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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04:EC:A9:60:00:00 /28
SHANGHAI CHENZHU INSTRUMENT CO., LTD.
Next
04:EC:A9:80:00:00 /28
Guangzhou Xinhong Communication Technology Co.,Ltd
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
CORETEC Inc. holds 1 registered blocks in the IEEE registry, ranking #9,216 of 33,427 organizations by block count.