Generate a random number of any length
Download and unzip the file linked below directly to your C:\Program Files (x86)\AccuZIP6 5.0 folder.
https://www.accuzip.com/files/forum/genrandom.zip
Import your list, and create a field that you want the number to be stored in using Edit menu>Fields. The field LENGTH determines the highest random number that will be generated. If the field length is 4, then the highest number could be 9999. Character fields are padded with 0, e.g., 0001
Click on Edit>Command, and run this syntax, substituting the word fieldname with the actual field name you created:
=GenRandom("fieldname") |
Click Run.
You can then close the command window, and you'll see a random number filling that field, and they will all be 100% unique.