cut a spacific text in richtextbox

private void button1_Click(object sender, EventArgs e)
        {
            string[] x = { "SUV 4402577816 ABC 00:00:00 109.127.100.33", "SUV 6651215553 ABC 00:00:00 109.127.104.75", "SUV 6651231564 ABC 00:00:00 93.91.192.232" };
            for (int i = 0; i<x.Length; i++)
            {
                string[] d = x[i].Split(' ');
                MessageBox.Show(d[4].ToString());
            }
        }