MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
Prefix4C:91:7A:30:00:00 /28
Vendor addressNauchnuy Proezd 10 Moscow RU 117246
Country🇷🇺 Russia
RegisteredSep 23, 2018
Block range4C:91:7A:30:00:00– 4C:91:7A:3F: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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4C:91:7A:20:00:00 /28
Chongqing Unisinsight Technology Co.,Ltd.
Next
4C:91:7A:40:00:00 /28
LumiGrow Inc.
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
Smart Access holds 1 registered blocks in the IEEE registry, ranking #27,683 of 33,427 organizations by block count.