IP ADDRESS and HOST NAME
Below is a code where visitor's IP address and host name is displayed. Just copy and paste it into your site.
<script language="JavaScript">
VIH_BackColor="palegreen";
VIH_ForeColor="navy";
VIH_FontPix="16";
VIH_DisplayFormat="You are visiting from:<br>
IP Address:%%IP%%<br>Host:%%HOST%%";
VIH_DisplayPage="yes";
</script><script language="JavaScript" src="http://scripts.hashemian.com/js/visitorIPHOST.js.php"></script>