MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
Prefix18:A5:9C:A0:00:00 /28
Vendor addressKarasek1d Brno CZ 62100
Country🇨🇿 Czechia
RegisteredFeb 16, 2022
Block range18:A5:9C:A0:00:00– 18:A5:9C: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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18:A5:9C:90:00:00 /28
estun automation co.,ltd
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18:A5:9C:B0:00:00 /28
CAL-COMP INDUSTRIA E COMERCIO DE ELETRONICOS E INFORMATICA LTDA
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
Erba Lachema s.r.o. holds 3 registered blocks in the IEEE registry, ranking #1,035 of 33,421 organizations by block count.
Other blocks registered to Erba Lachema s.r.o.