From 555624decf82890d0531f541e9d8062990f8362e Mon Sep 17 00:00:00 2001
From: 3D-I <480857+3D-I@users.noreply.github.com>
Date: Sat, 30 May 2020 21:26:09 +0200
Subject: [PATCH] [ticket/16503] Fix WhoIs lookup

PHPBB3-16503
---
 phpBB/includes/functions_user.php | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/phpBB/includes/functions_user.php b/phpBB/includes/functions_user.php
index f2e73229e8..d39dbed5ff 100644
--- a/phpBB/includes/functions_user.php
+++ b/phpBB/includes/functions_user.php
@@ -1470,6 +1470,9 @@ function user_ipwhois($ip)
 
 	$ipwhois = '';
 
+	// Limit the query to all possible flags (whois.arin.net)
+	$ip = 'z ' . $ip;
+
 	if (($fsk = @fsockopen($whois_host, 43)))
 	{
 		// CRLF as per RFC3912