TECNOALARM S.r.l.

MA-L

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

Prefix00:21:DC:00:00:00 /24

Vendor addressVia Cirie' San Mauro Torinese Torino IT 10099

RegisteredJun 18, 2008

Block range00:21:DC:00:00:00– 00:21:DC: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

00:21:DC:00:00:00 00:21:DC:7F:FF:FF 00:21:DC:FF:FF:FF

Where this block sits

Previous 00:21:DB:00:00:00 /24 Santachi Video Technology (Shenzhen) Co., Ltd. Next 00:21:DD:00:00:00 /24 Northstar Systems Corp

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

TECNOALARM S.r.l. holds 1 registered blocks in the IEEE registry, ranking #29,423 of 33,427 organizations by block count.