MA-L: a full /24 OUI block, IEEE's largest, covering 16,777,216 addresses.
Prefix84:A9:91:00:00:00 /24
Vendor addressSetagaya-ku Tokyo JP 155-0031
Country🇯🇵 Japan
RegisteredApr 15, 2010
Block range84:A9:91:00:00:00– 84:A9:91: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
Where this block sits
Cyber Trans Japan Co.,Ltd. holds 1 registered blocks in the IEEE registry, ranking #9,567 of 33,427 organizations by block count.