Index: wp-includes/pluggable.php
===================================================================
--- wp-includes/pluggable.php	(revision 16292)
+++ wp-includes/pluggable.php	(working copy)
@@ -1025,7 +1025,7 @@
 		$notify_message .= sprintf( __('Author : %1$s (IP: %2$s , %3$s)'), $comment->comment_author, $comment->comment_author_IP, $comment_author_domain ) . "\r\n";
 		$notify_message .= sprintf( __('E-mail : %s'), $comment->comment_author_email ) . "\r\n";
 		$notify_message .= sprintf( __('URL    : %s'), $comment->comment_author_url ) . "\r\n";
-		$notify_message .= sprintf( __('Whois  : http://ws.arin.net/cgi-bin/whois.pl?queryinput=%s'), $comment->comment_author_IP ) . "\r\n";
+		$notify_message .= sprintf( __('Whois  : http://whois.arin.net/rest/ip/%s'), $comment->comment_author_IP ) . "\r\n";
 		$notify_message .= __('Comment: ') . "\r\n" . $comment->comment_content . "\r\n\r\n";
 		$notify_message .= __('You can see all comments on this post here: ') . "\r\n";
 		/* translators: 1: blog name, 2: post title */
@@ -1138,7 +1138,7 @@
 			$notify_message .= sprintf( __('Author : %1$s (IP: %2$s , %3$s)'), $comment->comment_author, $comment->comment_author_IP, $comment_author_domain ) . "\r\n";
 			$notify_message .= sprintf( __('E-mail : %s'), $comment->comment_author_email ) . "\r\n";
 			$notify_message .= sprintf( __('URL    : %s'), $comment->comment_author_url ) . "\r\n";
-			$notify_message .= sprintf( __('Whois  : http://ws.arin.net/cgi-bin/whois.pl?queryinput=%s'), $comment->comment_author_IP ) . "\r\n";
+			$notify_message .= sprintf( __('Whois  : http://whois.arin.net/rest/ip/%s'), $comment->comment_author_IP ) . "\r\n";
 			$notify_message .= __('Comment: ') . "\r\n" . $comment->comment_content . "\r\n\r\n";
 			break;
 	}