What load can i connect if data sheet is missing output voltage
I am looking at a DC to DC converter data sheet that has an input voltage of 0V-100V. 




Figure 1. From the datasheet.

No you're not. That's in input filter for a DC-DC converter. From the datasheet:


  Power-One offers a complete range of input filters to
  help control EMI in board-level DC-DC converter
  applications. 


The voltage rating will tell you the maximum voltage that the filter can withstand between positive and negative lines.

The current rating is the maximum current that the device can handle through the filter.