Shimizu Electric Co., Ltd.
IAB
IAB: an Individual Address Block, a /36 covering 4,096 addresses. IEEE's predecessor to MA-S; no longer issued, but existing assignments remain valid.
Prefix40:D8:55:0D:50:00 /36
Vendor addressNakayabe-cho 10-10 Shimizu-ku Shizuoka-shi Shizuoka-ken JP 424-0854
Country🇯🇵 Japan
Block range40:D8:55:0D:50:00– 40:D8:55:0D:5F:FF
Address capacity4,096
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