If your dealing with Experian then it ranges up to 1000. A reasonable score is about 800 and above, good somewhere higher than that. Each company has it's own criteria when lending so a credit score is only a very general indication.
A good score is above 720. Ranges are from 300-850 BUT on FICO scale. There are many different scales used by credit bureaus. Check http://online-today.com/credit-score-range/ for more.