This book constitutes the thoroughly refereed post-proceedings of the International Conference on Information Networking, ICOIN 2006 held in Sendai, Japan in January 2006.The 98 revised full papers presented were carefully selected and improved during two rounds of reviewing and revision from a total of 468 submissions. The papers are organized in topical sections on mobile and ubiquitous networking, ad hoc and sensor networks, advanced networking, QoS and resource management, network and transport protocols, network security, applications and services, peer-to-peer and overlay networks.