MA-L: a full /24 OUI block, IEEE's largest, covering 16,777,216 addresses.
Prefix50:41:B9:00:00:00 /24
Vendor address3-10,Sakurada-machi Kanazawa Ishikawa JP 920-8512
Country🇯🇵 Japan
RegisteredJan 29, 2019
Block range50:41:B9:00:00:00– 50:41:B9: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
- Jan 29, 2019 – Jul 2, 2026 I-O DATA DEVICE,INC. name changed
- Jul 2, 2026 – present I-O DATA, INC.
Example addresses in this block
Where this block sits
I-O DATA, INC. holds 3 registered blocks in the IEEE registry, ranking #1,102 of 33,427 organizations by block count.
Other blocks registered to I-O DATA, INC.