Two name services are available from the Solaris implementation of TCP/IP: NIS+ and DNS.
NIS+ - NIS+ provides centralized control over network administration services, such as mapping host names to IP and Ethernet addresses, verifying passwords, and so on. See Solaris Naming Administration Guide for complete details.
Domain Name System - The Domain Name System (DNS) provides host names to the IP address service. It also serves as a database for mail administration. For a complete description of this service, see Solaris Naming Administration Guide. See also the in.named(1M) man page.