IPv4 Classes are commonly known as the Internet Protocol version 4, which is the fourth consecutive revision in the progressive development of the Internet Protocol as well as it is the primary version of the widely deployed protocol since the beginning of the internet. It can be called the core of the internetworking methods of the world wide web, in combination with IPv6. Although the talks for deploying the IPv6 full fledged across the realm of cyberspace continues amongst the web hosting companies. But it’s a major and the evident fact that as per this year 2012, the IPv4 is the most widely used protocol for Internet Layer.
IPv4 network classes use a four-byte or 32-bit addresses that consequently limit the entire address space to a mere 4294967296 addresses. Here all the address classes in IPv4 were credited to the users while the volume of accredited IPv4 addresses decreased. The exhaustion of IPv4 addresses was first noticed in the month of February, 2011. However, the IPv4 has a reserve of special address blocks of nearly 18 million addresses, for private networks. On the other hand it has a backup of 270 million addresses as multicast addresses.
IPv4 addresses are represented in any kind of notation expressing a 32-bit of integer value. For the laymen to understand this phenomenon, all of it is mostly written in a notation of dot-decimal. This consists of 4 octets of the individually expressed addresses in decimal that is separated by periods.