using System;

using System.Net;

​

public class IpPacks

{

​

    public static Byte[] PackIP(string ipAddress)

    {

        Byte[] address = IPAddress.Parse(ipAddress).GetAddressBytes();

        var ip_packed = new byte[16];

        Buffer.BlockCopy(address, 0, ip_packed, 16 - address.Length, address.Length);

        return ip_packed;

    }

    public static void Main()

    {

        Console.WriteLine(BitConverter.ToString(PackIP("2a00:1450:4001:811::200e")).Replace("-", string.Empty));

        Console.WriteLine(BitConverter.ToString(PackIP("142.250.185.174")).Replace("-", string.Empty));

    }

}