MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
Prefix90:F4:21:50:00:00 /28
Vendor addressGottlieb-Keim-Str. 56 Bayreuth Bavaria DE 95448
Country🇩🇪 Germany
RegisteredMar 16, 2023
Block range90:F4:21:50:00:00– 90:F4:21:5F: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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90:F4:21:40:00:00 /28
Sansap Technology Pvt. Ltd.
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90:F4:21:60:00:00 /28
Wuxi Sunning Smart Devices Co.,Ltd
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
DESKO GmbH holds 1 registered blocks in the IEEE registry, ranking #10,165 of 33,427 organizations by block count.