diff --git a/php/Snoopy.class.inc b/php/Snoopy.class.inc
index 03a3cca47..1a1c922aa 100644
--- a/php/Snoopy.class.inc
+++ b/php/Snoopy.class.inc
@@ -80,6 +80,7 @@ class Snoopy
 	// send Accept-encoding: gzip?
 	var $use_gzip		=	true;	
 	var $IP			=	null;
+	var $useIpv4		=	false;
 
 	/**** Private variables ****/	
 
@@ -524,6 +525,9 @@ class Snoopy
 		if(!is_null($this->IP))
 			$cmdline_params .= " --interface ".$this->IP;
 
+		if($this->useIpv4)
+			$cmdline_params .= " --ipv4";
+
 		if($this->_isproxy)
 			$cmdline_params .= " --proxy-insecure --proxy ".(empty($this->proxy_proto) ? '' : $this->proxy_proto.'://').$this->proxy_host.":".$this->proxy_port;
 		
diff --git a/plugins/check_port/action.php b/plugins/check_port/action.php
index e7e59469c..65e0dc55c 100644
--- a/plugins/check_port/action.php
+++ b/plugins/check_port/action.php
@@ -33,8 +33,11 @@
 
 function get_ip($url,$ipMatch)
 {
+	global $useIpv4;
+
 	$client = new Snoopy();
 	$client->proxy_host = "";
+	$client->useIpv4 = $useIpv4;
 
 	@$client->fetch($url);
 
@@ -48,9 +51,11 @@ function get_ip($url,$ipMatch)
 function check_port($ip,$port,$checker,$closed,$open)
 {
 	global $useWebsite;
+	global $useIpv4;
 
 	$client = new Snoopy();
 	$client->proxy_host = "";
+	$client->useIpv4 = $useIpv4;
 
 	if($useWebsite=="yougetsignal")
 		$parse = "remoteAddress=".$ip."&portNumber=".$port;
diff --git a/plugins/check_port/conf.php b/plugins/check_port/conf.php
index 74729e957..cc11dc232 100644
--- a/plugins/check_port/conf.php
+++ b/plugins/check_port/conf.php
@@ -5,3 +5,5 @@
 				// false - disable check_port plugin
 				// "yougetsignal" - use https://www.yougetsignal.com/tools/open-ports/
 				// "portchecker" - use https://portchecker.co/
+
+$useIpv4 = true;		// use ipv4 addresses when checking ports, unless website supports ipv6