diff --git a/ionos_dyndns.py b/ionos_dyndns.py
index ddabf3b..1db893c 100644
--- a/ionos_dyndns.py
+++ b/ionos_dyndns.py
@@ -136,7 +136,7 @@ def main():
 
 def get_domain_from_fqdn(fqdn):
     # Place the hyphen at the start of the character class to avoid misinterpretation
-    regex = r"(?:(?:[\w-]+)\.)+([\w-]+\.\w+)$"
+    regex = r"(?:(?:[\w-]+)\.)?([\w-]+\.\w+)$"
     match = re.search(regex, fqdn, re.IGNORECASE)
     return match.group(1) if match else None