MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
Prefix7C:E4:A1:70:00:00 /28
Vendor addressEstrada Nacional 109/IC 1 Zona Industrial de Ovar, Pardala Ovar Aveiro PT 3880-728
Country🇵🇹 Portugal
RegisteredJul 23, 2026
Block range7C:E4:A1:70:00:00– 7C:E4:A1:7F: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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7C:E4:A1:60:00:00 /28
ISR Technologies Israel Ltd
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7C:E4:A1:80:00:00 /28
Shenzhen Liandian Communication Technology Co.LTD
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
Keenfinity S.A. holds 1 registered blocks in the IEEE registry, ranking #17,545 of 33,421 organizations by block count.