MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
Prefix74:E1:4A:10:00:00 /28
Vendor addressRiver-side-seven bldg. 3F, 2-7-9, Sotokanda Tiyoda Tokyo JP 101-0021
Country🇯🇵 Japan
RegisteredOct 16, 2015
Block range74:E1:4A:10:00:00– 74:E1:4A:1F: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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74:E1:4A:00:00:00 /28
Altenburger Electronic GmbH
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74:E1:4A:20:00:00 /28
KLIMAT SOLEC Sp. z o.o.
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
Cerevo Inc. holds 1 registered blocks in the IEEE registry, ranking #8,091 of 33,421 organizations by block count.