The 12th Asian Internet Engineering Conference (AINTEC) provides an international technical forum for experts from industry and academia. AINTEC especially aims at addressing issues pertinent to the Asia and Pacific region, with vast diversities of socio-economic and networking conditions, while inviting high quality and recent research results from the Internet research community at large. AINTEC 2016 follows the tenth successful editions held in Thailand, in cooperation with ACM SIGCOMM(In Process). The conference is single-track and features a technical program with significant opportunities for individual and small-group discussions among a diverse set of participants.