using System;

using System.Net;

using System.Linq;

public class Program

{

    public static void Main()

    {

        //http://stackoverflow.com/questions/461742/how-to-convert-an-ipv4-address-into-a-integer-in-c

        Console.WriteLine(IPAddressToInt64("64.233.187.99"));

        Console.WriteLine(IPAddressFromInt64(1089059683));

    }

    public static long IPAddressToInt64(string ip)

    {

        //return BitConverter.ToInt32(IPAddress.Parse(ip).GetAddressBytes().Reverse().ToArray(), 0);    

        return (long)(uint)IPAddress.NetworkToHostOrder(BitConverter.ToInt32(IPAddress.Parse(ip).GetAddressBytes(), 0));

        // careful of sign extension: convert to uint first;

        // unsigned NetworkToHostOrder ought to be provided.

        //return (long) (uint) IPAddress.NetworkToHostOrder(

             //(int) IPAddress.Parse(ip).Address);

    }

    public static string IPAddressFromInt64(long ip) 

    {

        //return new IPAddress(BitConverter.GetBytes(ip)).ToString();   

        return IPAddress.Parse(ip.ToString()).ToString();

    }

}