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:81:BE:10:00:00 /28
Vendor addressHoheneichstr. 29 Keltern DE 75210
Country🇩🇪 Germany
Block range4C:81:BE:10:00:00– 4C:81:BE:1F: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
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
EUROSONIC Ultraschall GmbH & Co. KG holds 1 registered blocks in the IEEE registry, ranking #12,223 of 33,421 organizations by block count.