MA-L: a full /24 OUI block, IEEE's largest, covering 16,777,216 addresses.
Prefix00:04:5D:00:00:00 /24
Vendor addressSiemenstraße 29 Erftstadt DE 50374
Country🇩🇪 Germany
RegisteredNov 23, 2000
Block range00:04:5D:00:00:00– 00:04:5D:FF:FF:FF
Address capacity16,777,216
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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00:04:5C:00:00:00 /24
Mobiwave Pte Ltd
Next
00:04:5E:00:00:00 /24
PolyTrax Information Technology AG
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
BEKA Elektronik holds 1 registered blocks in the IEEE registry, ranking #6,813 of 33,427 organizations by block count.