using System;

​

public class Program

{

    public static void Main()

    {

        var ip1 = "222.111.111.111";

        var ip2 = "1.2.3.04";

        var ip3 = "555...555"; 

        var ip4 = "000.000.000.000";

        Console.WriteLine(ip1 + '=' + ValidateIPAddress(ip1));

        Console.WriteLine(ip2 + '=' + ValidateIPAddress(ip2));

        Console.WriteLine(ip3 + '=' + ValidateIPAddress(ip3));

        Console.WriteLine(ip4 + '=' + ValidateIPAddress(ip4));

    }

​

    public static int ValidateIPAddress(string IP)

    {

        var splitIP = IP.Split('.');

        if (splitIP.Length != 4)

        {

            return 0;

        }

​

        foreach (var ipPart in splitIP)

        {

            if ( string.IsNullOrEmpty(ipPart)

                 || ipPart.StartsWith("0") 

                 || !(int.Parse(ipPart) <= 255))

            {

                return 0;

            }

        }

        return 1;

    }

}