diff --git a/includes/functions.php b/includes/functions.php
index 4d299314..1304d61f 100755
--- a/includes/functions.php
+++ b/includes/functions.php
@@ -452,3 +452,8 @@ function getBridgedState()
     return  $arrHostapdConf['BridgedEnable'];
 }
 
+// Validates a host or FQDN
+function validate_host($host) {
+  return preg_match('/^([a-z\d](-*[a-z\d])*)(\.([a-z\d](-*[a-z\d])*))*$/i', $host);
+}
+