Are Domain Name Server and Name Server the same thing?

There is no such thing as a Domain Name Server. DNS stands for Domain Name System, which is simply a hierarchy of Name Servers that has the intent to translate host names into IP addresses on a global scale. A name server hosts or caches these translations, in the case where they are hosted the name server is often called a DNS Server. Counting all name servers is a bit tricky, because you can't simply enumerate all the domains. Let me give you an example on resolving in a non-cached way: The n…