Index: ParserFunctions.php
===================================================================
--- ParserFunctions.php	(revision 46673)
+++ ParserFunctions.php	(working copy)
@@ -48,6 +48,7 @@
 		$parser->setFunctionHook( 'timel', array( &$this, 'localTime' ) );
 		$parser->setFunctionHook( 'rel2abs', array( &$this, 'rel2abs' ) );
 		$parser->setFunctionHook( 'titleparts', array( &$this, 'titleparts' ) );
+		$parser->setFunctionHook( 'ip', array( &$this, 'ip' ) );
 
 		return true;
 	}
@@ -516,6 +517,10 @@
 			return $title;
 		}
 	}
+	public function ip( $parser, $title = '')
+	{
+		return IP::isIPAddress($title);
+	}
 }
 
 function wfSetupParserFunctions() {
Index: ParserFunctions.i18n.magic.php
===================================================================
--- ParserFunctions.i18n.magic.php	(revision 46673)
+++ ParserFunctions.i18n.magic.php	(working copy)
@@ -25,6 +25,7 @@
 		'timel'      => array( 0, 'timel' ),
 		'rel2abs'    => array( 0, 'rel2abs' ),
 		'titleparts' => array( 0, 'titleparts' ),
+		'ip'         => array( 0, 'ip' ),
 	);
 
 	/**