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

RegisteredSep 8, 2000

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 →

Ownership timeline

Sep 8, 2000 – Jun 5, 2002 ENT-EMPRESA NACIONAL name changedaddress changedcountry changed
Jun 5, 2002 – present ENT-EMPRESA NACIONAL DE TELECOMMUNICACOES, S.A.

Example addresses in this block

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

Where this block sits

Previous 00:90:CC:00:00:00 /24 PLANEX COMMUNICATIONS INC. Next 00:90:CE:00:00:00 /24 avateramedical Mechatronics GmbH

The nearest registered blocks of the same size on either side of this one in IEEE's address space.

ENT-EMPRESA NACIONAL DE TELECOMMUNICACOES, S.A. holds 1 registered blocks in the IEEE registry, ranking #11,887 of 33,427 organizations by block count.