According to United Nations survey the world
population is likely to reach 7 billion by 2050 and around
70% of them will be living in cities sine around 50,000
people across the globe move from rural areas to urban
areas every day. At the present trend of ICT penetration
rate by 2020 more than 50 billion devices will be
connected to web, hence IPv4 will not be able to assign
Internet Protocol (IP) address to this exponentially
growing networked society. In 2019 IPv6 is likely to
replace the current IPv4 and to be established as
standard Internet protocol. This paper is a comparative
study of IPv4 and IPv6 and role of IPv6 in the future
scenario of growing connected society.