<A target="_blank" href="http://www.pcworld.com/article/217355/your_ip_address_may_soon_be_an_antique.html?tk=rss_news">IPv4 (Internet Protocol version 4) is the current standard of internet connectivity</A>. But, it only allows for 4 billion individual addresses. Version 6 (IPv6) allows for many more addresses and is slowly being implemented by major ISPs.