MA-L: a full /24 OUI block, IEEE's largest, covering 16,777,216 addresses.
Prefix00:03:AC:00:00:00 /24
Vendor addressGünter Fronius-Straße 1 AT
Country🇦🇹 Austria
RegisteredNov 9, 2000
Block range00:03:AC:00:00:00– 00:03:AC: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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00:03:AB:00:00:00 /24
Bridge Information Systems
Next
00:03:AD:00:00:00 /24
Emerson Energy Systems AB
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
Fronius Schweissmaschinen holds 1 registered blocks in the IEEE registry, ranking #13,074 of 33,427 organizations by block count.