They aren't completely random, so you'd probably at least want to pick one from the expected prefixes list: https://www.ssa.gov/employer/stateweb.htm https://w

They aren't completely random, so you'd probably at least want to pick one from the expected prefixes list: https://www.ssa.gov/employer/stateweb.htm https://www.ssa.gov/employer/stateweb.htm That leaves you with six digits to choose.