We are running out of IPv4 addresses. Although it would take a while until we completely run out of IPv4 addresses to develop new services and applications, the shortage of IPv4 addresses is evident. IPv4 addresses are becoming harder to get and more expensive. Obviously, IPv4 still runs most of our networks, but in long-term technological development, IPv6 will be the only solution. IPv6 is already starting to fulfill its mission: to deal with the lack and exhaustion of IPv4 addresses. What’s the problem with IPv4? The first formal standard of IPv4 (our beloved Internet Protocol addressing and identification scheme)