Not sure on the format you're looking for on the randomizer. Assuming it's going to be 1-4 5-8 and 9-12 for the divisions, I ran the randomizer.
Research Randomizer Results
1 Set of 12 Unique Numbers Per Set
Range: From 1 to 12 -- Unsorted
Job Status:
Set #1:
11, 10, 8, 6, 12, 9, 7, 2, 5, 3, 4, 1
If that's not what you're looking for then sorry.
and jflatour99, the website is at http://www.randomizer.org/form.htm