macadress

OPTO-22

MA-L
MA-L: a full /24 OUI block, IEEE's largest, covering 16,777,216 addresses.
Prefix00:A0:3D:00:00:00 /24
Vendor address43044 BUSINESS PARK DR. TEMECULA CA US 92590
Country🇺🇸  United States
RegisteredApr 22, 1998
Block range00:A0:3D:00:00:00– 00:A0:3D: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

  1. Apr 22, 1998 – Jun 5, 2002 OPTO - 22 name changed
  2. Jun 5, 2002 – present OPTO-22

Example addresses in this block

00:A0:3D:00:00:00 00:A0:3D:7F:FF:FF 00:A0:3D:FF:FF:FF

Where this block sits

Previous 00:A0:3C:00:00:00 /24 EG&G NUCLEAR INSTRUMENTS Next 00:A0:3E:00:00:00 /24 ATM FORUM

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

OPTO-22 holds 1 registered blocks in the IEEE registry, ranking #22,207 of 33,427 organizations by block count.