IN ONE SMART TECHNOLOGY(H,K,)LIMITED

MA-L

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

Prefix28:1D:21:00:00:00 /24

Vendor addressUNIT I 1/F MAU LAM COMM BLDG 16-18 MAU LAM ST JORDAN KL HK HONGKONG HK 999077

RegisteredSep 1, 2021

Block range28:1D:21:00:00:00– 28:1D:21: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

28:1D:21:00:00:00 28:1D:21:7F:FF:FF 28:1D:21:FF:FF:FF

Where this block sits

IN ONE SMART TECHNOLOGY(H,K,)LIMITED holds 1 registered blocks in the IEEE registry, ranking #15,830 of 33,421 organizations by block count.