Random number generator is a tool which generates random number based on your parameters within your chosen range.
As default number range is set from 1 to 99. You can change maximal number up to 999,999,999. In more options section minimum number field defines lowest value in the range. In addition you can enter how many numbers should be generated in field count.
If you look for random character set instead, use one of random string generators listed in related tools below.