A-First Technology Co., Ltd. (00:15:66:00:00:00 /24)

A-First Technology Co., Ltd. MA-L

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

Prefix00:15:66:00:00:00 /24

Vendor address5F, No. 111-2, Shin-Teh Rd., San-Chung City Taipei Shien TW 241

Block range00:15:66:00:00:00– 00:15:66: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

00:15:66:00:00:00 00:15:66:7F:FF:FF 00:15:66:FF:FF:FF