MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
Prefix4C:6E:44:A0:00:00 /28
Vendor addressKeldenicher Str. 18 Bornheim DE 53332
Country🇩🇪 Germany
RegisteredApr 7, 2026
Block range4C:6E:44:A0:00:00– 4C:6E:44: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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4C:6E:44:90:00:00 /28
Chengdu Ruibitechuang Technology Co.,Ltd
Next
4C:6E:44:B0:00:00 /28
NovaFly LLC
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
Swistec GmbH holds 2 registered blocks in the IEEE registry, ranking #3,178 of 33,427 organizations by block count.
Other blocks registered to Swistec GmbH