Avast Software s.r.o. (E4:1E:0A:30:00:00 /28)

Avast Software s.r.o. MA-M

MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.

PrefixE4:1E:0A:30:00:00 /28

Vendor addressPikrtova 1737/1a Prague 4 CZ 14000

Block rangeE4:1E:0A:30:00:00– E4:1E:0A:3F: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

E4:1E:0A:30:00:00 E4:1E:0A:37:FF:FF E4:1E:0A:3F:FF:FF