StringBuilder sb = new StringBuilder();
Formatter formatter = new Formatter(sb, Locale.US);
formatter.format("%-16s ---%-21s--- %-21s %-23s %-25s", "IP", "BLOCKED", "BLOCKED TILL", "ACTIVITY (00:00-24:00)", "COUNTRY");
System.out.println(sb.toString());

IP               ---BLOCKED              --- BLOCKED TILL          ACTIVITY (00:00-24:00)  COUNTRY