Back in January this year the total number of available IPv4 address ran out so no more new IPv4 addresses can be issued. You actually have one reserved for you right now as you surf through the internet. With ever increasing number of devices on the internet, the only long-term solution to this problem is adoption of IPv6, which provides over 4 billion times more address allocation space. IPv6 is used extensively in many large networks already. To make it simpler an IPv4 address looks something like 192.67.1.1. While on the other hand an IPv6 address looks like 2001:0db8:85a3:0000:0000:8a2e:0370:7334. This gives a great number of addresses that can be assigned.
