MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
Prefix40:F3:85:D0:00:00 /28
Vendor addressvia Tortona, 37 Milan MI IT 20144
Country🇮🇹 Italy
RegisteredNov 6, 2016
Block range40:F3:85:D0:00:00– 40:F3:85:DF: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.
Digital Bros S.p.A. holds 1 registered blocks in the IEEE registry, ranking #10,356 of 33,421 organizations by block count.