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In this paper, we compare performances of Internet applications in a transition network model of IPv6 to IPv4 (6 to 4) tunneling with those IPv4-only and IPv6-only network models. These applications are remote login, web browsing, voice communication, database transaction, and video streaming. The objective of this study is to investigate the differences in bandwidth requirements and delay effects among the three network models in order to prepare for future network capacity planning of Internet Service Providers. The performance studies are done through the OPNET v14.5 simulator to investigate the impacts on these applications for service providers which still have limited implementation of IPv6 and transition networks. The focused performance parameters are throughput and delay of these five different Internet applications.