MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
Prefix04:58:5D:20:00:00 /28
Vendor addressAv. Marginal da Rodovia dos Bandeirantes, 800 - Distrito Industrial Jundiaí Sao Paulo BR 13213-008
Country🇧🇷 Brazil
RegisteredMay 22, 2025
Block range04:58:5D:20:00:00– 04:58:5D:2F: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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04:58:5D:10:00:00 /28
Research Laboratory of Design Automation, Ltd.
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04:58:5D:30:00:00 /28
REXXON GmbH
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
Foxconn Brasil Industria e Comercio Ltda holds 3 registered blocks in the IEEE registry, ranking #1,050 of 33,427 organizations by block count.
Other blocks registered to Foxconn Brasil Industria e Comercio Ltda