This is historic day where Ipv4 addresses had occupied completely, and this is the time we should use Ipv6, a new Internet protocol address, to manage new addresses. However, this is not the end of Ipv4, where we are not stopping for using it, but now, the organization are readily to take conversion from Ipv4 to Ipv6.
Refer: http://www.icann.org for more information.
