ROHM CO., LTD. (00:1D:12:00:00:00 /24)

ROHM CO., LTD. MA-L

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

Prefix00:1D:12:00:00:00 /24

Vendor address21 Saiin-Mizosaki-cho, Kyoto-shi KYOTO JP 615-8585

Block range00:1D:12:00:00:00– 00:1D:12: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

00:1D:12:00:00:00 00:1D:12:7F:FF:FF 00:1D:12:FF:FF:FF