What this means
The IEEE assigned the MA-L block AC00F9 to BizLink Technology (S.E.A) Sdn. Bhd.. Every network interface they manufacture under this block has a MAC address beginning with these digits, followed by a unique per-device identifier. If a device on your network shows a MAC starting AC:00:F9, it is BizLink Technology (S.E.A) Sdn. Bhd. hardware.