Therefore, a DNS server contains mappings/associations of Domain Names to IP addresses. A Resolver is the software on the DNS client who is asking the server for information. The server keeps information about which DNS names correspond to which IP addresses. If the address is registered in a reverse lookup zone, the IP address is translated back to the DNS name and it is called “reverse DNS lookup” or simply r-DNS.Ī DNS system consists of two parts: a server and a resolver. Note that all TCP/IP communication is based on IP addresses. This is required in order to reach this domain (i.e the webserver hosting the domain) over the Internet. Keep in mind that every domain name on the Internet must be associated with an IP address (either IPv4 or IPv6). A Domain Name could be for example (i.e the website you are reading right now) that the DNS translates to an IP address (example 74.54.219.242).
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