diff --git a/default.inc b/default.inc
index eb91585..a7f04bf 100755
--- a/default.inc
+++ b/default.inc
@@ -238,8 +238,11 @@ service_exists() {
 
 CHECK_HOST(){
 	if [ ! -z ${1+x} ]; then
-		# if [ "$(nmap ${host} -p 22,80,443 -n | grep open)" != "" ] || [ "$(nmap -sU ${host} -p 161 -n | grep open)" != "" ]; then
-		ping -c 3 ${1} > /dev/null 2>&1
+		if [ "$(dpkg-query -W --showformat='${Status}\n' nmap 2>/dev/null | grep "install ok installed")" != "" ]; then
+			[ "$(nmap ${host} -p 22,80,443 -n | grep open)" != "" ] || [ "$(nmap -sU ${host} -p 161 -n | grep open)" != "" ] && echo true || echo false
+		else
+			ping -c 3 ${1} > /dev/null 2>&1
+		fi
 		[ $? -ne 0 ] && echo false || echo true
 	else
 		echo false