MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
PrefixB0:1F:81:A0:00:00 /28
Vendor addressMathias-Brüggenstr. 83 Cologne NRW DE 50829
Country🇩🇪 Germany
RegisteredOct 16, 2015
Block rangeB0:1F:81:A0:00:00– B0:1F:81:AF: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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B0:1F:81:90:00:00 /28
CIDE Interactive
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B0:1F:81:B0:00:00 /28
Rademacher Geraete-Elektronik GmbH
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
Steffens Systems GmbH holds 1 registered blocks in the IEEE registry, ranking #28,363 of 33,421 organizations by block count.