GYT, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var max = "904625697166532776746648320380374280100293470930272690489102837043110636675";
            var rnd = new Random();
            int length = rnd.Next(1, max.Length);
            
            string result = "";
            bool secure = length == max.Length;
            
            for (int i = 0; i < length; i++)
            {
                int maxDigit = 9;
                int secureMaxDigit = int.Parse(max.Substring(i, 1));
                if (secure)
                {
                    maxDigit = secureMaxDigit;
                }
                
                var digit = rnd.Next(i == 0 ? 1 : 0, maxDigit);
                
                if (secure && digit != secureMaxDigit)
                {
                    secure = false;
                }
                
                result += digit.ToString();
            }
            
            Console.WriteLine(@"http://directory.io/" + result);
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,16 sec, absolute running time: 0,09 sec, cpu time: 0,08 sec, average memory usage: 12 Mb, average nr of threads: 2