diff --git a/classes/DNSQuery.php b/classes/DNSQuery.php
index 0aa512c..f699163 100644
--- a/classes/DNSQuery.php
+++ b/classes/DNSQuery.php
@@ -209,13 +209,19 @@ private function sanitizeHostname(string $hostname): string {
             throw new InvalidArgumentException("Hostname cannot be empty");
         }
         
+        // Remove protocol if present (http:// or https://)
+        $hostname = preg_replace('/^https?:\/\//i', '', $hostname);
+        
+        // Remove everything after the first slash (e.g., example.com/path → example.com)
+        $hostname = preg_replace('/\/.*$/', '', $hostname);
+        
         $hostname = preg_replace('/[^a-zA-Z0-9\.\-_:]/', '', $hostname);
         
         if (filter_var($hostname, FILTER_VALIDATE_IP)) {
             return $hostname;
         }
         
-        if (!preg_match('/^([a-zA-Z0-9]([a-zA-Z0-9\-]{0,61}[a-zA-Z0-9])?\.)*[a-zA-Z0-9]([a-zA-Z0-9\-]{0,61}[a-zA-Z0-9])?$/', $hostname)) {
+        if (!preg_match('/^([a-zA-Z0-9_](?:[a-zA-Z0-9\-_]{0,61}[a-zA-Z0-9_])?\.)*[a-zA-Z0-9_](?:[a-zA-Z0-9\-_]{0,61}[a-zA-Z0-9_])?$/', $hostname)) {
             throw new InvalidArgumentException("Invalid hostname format");
         }
         
@@ -541,4 +547,4 @@ private function extractTLD(string $hostname): string {
         
         return '';
     }
-}
\ No newline at end of file
+}