MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
Prefix18:C3:E4:20:00:00 /28
Vendor addressFloor 8, Unit 1/420 St Kilda Rd Melbourne Victoria AU 3004
Country🇦🇺 Australia
RegisteredFeb 12, 2026
Block range18:C3:E4:20:00:00– 18:C3:E4:2F: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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18:C3:E4:10:00:00 /28
HuiTong intelligence Company
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18:C3:E4:30:00:00 /28
Proximus sp. z .o.o.
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
Duress Pty Ltd holds 1 registered blocks in the IEEE registry, ranking #10,900 of 33,427 organizations by block count.