In 2005, the U.S. Government Accountability Office recommended that all agencies begin planning a coherent transition to IPv6. IPv6 will solve the problem of limited IP addresses and improve internetworking capabilities. This promising protocol is gaining momentum and it is only a matter of time before the transition will have to occur globally. The problem is that during the three-to-six year transition period, IPv6 and its predecessor, IPv4, will have to successfully coexist in order to ensure service continuity. Not only federal agencies, but corporations and institutions must start planning the transition to IPv6 now to maintain the operation, security, and interoperability of their networks. The implementation of IPv6 is essential to the continued growth of the internet and the development of new applications. The Handbook of IPv4 to IPv6 Transition Methodologies provides a wealth of best practices and procedures that will help corporations plan and implement a smooth transition to IPv6.