DNS is one of the three main pillars supporting domain services (DNS, Kerberos, and LDAP). Inside the local network, DNS acts to translate IP addresses into hostnames and vice versa. Fundamental to the Internet, DNS also translates domain names into IP addresses. There is a long history of DNS-related RFCs that document the many changes and adaptions DNS has undergone since its conception. Current DNS supports both IPv4 and IPv6. Basically, DNS is a network of databases established to resolve IP addresses and spans the world supporting all Internet traffic.