ENT-EMPRESA NACIONAL DE TELECOMMUNICACOES, S.A. (00:90:CD:00:00:00 /24)

ENT-EMPRESA NACIONAL DE TELECOMMUNICACOES, S.A. MA-L

MA-L: a full /24 OUI block, IEEE's largest, covering 16,777,216 addresses.

Prefix00:90:CD:00:00:00 /24

Vendor addressR. ENG FREDERICO ULRICH - APARTADO 3081 Guardeiras - 4470 Moreira Maia PT

Block range00:90:CD:00:00:00– 00:90:CD: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

00:90:CD:00:00:00 00:90:CD:7F:FF:FF 00:90:CD:FF:FF:FF