diff --git a/controllers/manage/POST.php b/controllers/manage/POST.php
index 3244b07..f5a15e3 100644
--- a/controllers/manage/POST.php
+++ b/controllers/manage/POST.php
@@ -36,6 +36,11 @@ function validateInput(string $url) {
         $matches
     );
     $hostname = $matches[1] ?? null;
+    if ($hostname[strlen($hostname) - 1] != ".") {
+        // add . so DNS lookup won't fail
+        $hostname .= ".";
+    }
+
     $matches = [];
     preg_match(
         "/^.*?:\/\/([0-9:.]+).*$/",