NAT is known as the
technology that is helping IPv4 hold on for dear life. It works by translating
private IP addresses to internet routable addresses since private IP addresses
are not routable on the internet. IPv4 has three classes of private IP addresses
and you can find more detail about them in RFC 1918. These private IPv4
addresses are typically used for internal devices like your Servers, PCs,
Laptops, Tablets, Cell Phone, Printers, etc.. For these devices to access the
internet they will have to be translated to routable addresses for processing
on the internet.
