Personal Kollen is an app where you can check if a social security number seems valid, and get random numbers, just like on personnummer.info
The application makes no records of the specified number. The only thing checked is that the last digit is a check digit that match other figures.
Since there are no records, I can not guarantee that random personal really is unused.
Personal Kollen is a perfect tool for software testers who need to use personal when testing.