Here in Argentina, we have a national ID. Many years ago the method for small towns was to asigne town A the range 123400-123499, town B 123500-123599, ... The

Here in Argentina, we have a national ID. Many years ago the method for small towns was to asigne town A the range 123400-123499, town B 123500-123599, ... The problem was when town A run out of numbers, so they continue 123500, 123501, ... So the number that is supouse to be nique, sometimes has repetitions.