MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
Prefix50:FA:CB:90:00:00 /28
Vendor addressEstrada Nacional 109/IC 1 Ovar Aveiro PT 3880-728
Country🇵🇹 Portugal
RegisteredAug 27, 2025
Block range50:FA:CB:90:00:00– 50:FA:CB:9F: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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50:FA:CB:80:00:00 /28
VeriFone Systems(China),Inc
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50:FA:CB:A0:00:00 /28
Varex Imaging Finland
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
Bosch Security Systems holds 2 registered blocks in the IEEE registry, ranking #1,656 of 33,427 organizations by block count.
Other blocks registered to Bosch Security Systems