server_info addresses hostname
              server_info   official_name   hostname  server_info
              aliases_name hostname
              Optain information about a TCP/IP server.

              If the addresses option is specified, the  list  of
              IP addresses for the hostname is returned.

              If the official_name option is specified, the offi-
              cial name for hostname is returned.

              If the aliases  option  is  specified,  a  list  of
              aliases for hostname is returned.