MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
PrefixB4:AB:F3:30:00:00 /28
Vendor addressEgon Eiermann Allee 4b, Karlsruhe 76187 Karlsruhe Baden Wurttenberg DE 76187
Country🇩🇪 Germany
RegisteredDec 17, 2025
Block rangeB4:AB:F3:30:00:00– B4:AB:F3:3F: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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B4:AB:F3:20:00:00 /28
Shenzhen Unicair Communication Technology Co., Ltd.
Next
B4:AB:F3:40:00:00 /28
Shenyang Tianwei Technology Co., Ltd
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
NubiCubi holds 1 registered blocks in the IEEE registry, ranking #21,714 of 33,427 organizations by block count.