The hostname property represents the hostname portion of the link's URL.
<html>
<head>
<title> Using the hostname property of the Link object</title>
</head>
<body>
<script language="JavaScript">
<!--
function showHostname(){
alert(document.links[0].hostname);
}
-->
</script>
Click the button to see the hostname for the URL
<form name="form1">
<a href="http://www.java2s.com">www.java2s.com</a>
<br><br>
<input type="button" name="host" value="Get Hostname Value" onClick='showHostname()'>
<br>
</form>
</body>
</html>