A C# helper class for generating random USA Social Security numbers. This was used in automated unit tests.

SocialSecurityNumberGenerator.cs

using System;

namespace Helpers
{
    /// <summary>
    /// Social Security Number Generator.
    /// </summary>
    public static class SocialSecurityNumberGenerator
    {
        /// <summary>
        /// Generates a random USA Social Security Number.
        /// </summary>
        /// <param name="delimiter">Optional delimiter.</param>
        /// <returns>Social Security Number.</returns>
        public static string GenerateSocialSecurityNumber(string delimiter = "")
        {
            var random = new Random(Guid.NewGuid().GetHashCode());

            var threeDigitSegment = random.Next(132, 921);
            var twoDigitSegment = random.Next(12, 83);
            var fourDigitSegment = random.Next(1423, 9211);

            return $"{threeDigitSegment}{delimiter}{twoDigitSegment}{delimiter}{fourDigitSegment}";
        }
    }
}