diff --git a/backend/main.py b/backend/main.py
index d90db67..55458a0 100644
--- a/backend/main.py
+++ b/backend/main.py
@@ -80,7 +80,16 @@ if __name__ == "__main__":
     if environment == 'test':
         cert_path = "ssl/mx-aare-test.psi.ch.pem"
         key_path = "ssl/mx-aare-test.psi.ch.key"
+        host = "0.0.0.0"  # Bind to all interfaces
+    else:
+        host = "127.0.0.1"  # Default for other environments
 
     # Run the application with appropriate SSL setup
-    uvicorn.run(app, port=8000, log_level="debug",
-                ssl_keyfile=key_path, ssl_certfile=cert_path)
+    uvicorn.run(
+        app,
+        host=host,
+        port=8000,
+        log_level="debug",
+        ssl_keyfile=key_path,
+        ssl_certfile=cert_path,
+    )
\ No newline at end of file
diff --git a/frontend/src/components/DewarDetails.tsx b/frontend/src/components/DewarDetails.tsx
index ff20885..c02b3bb 100644
--- a/frontend/src/components/DewarDetails.tsx
+++ b/frontend/src/components/DewarDetails.tsx
@@ -229,7 +229,7 @@ const DewarDetails: React.FC<DewarDetailsProps> = ({
 
     const validateEmail = (email: string) => /\S+@\S+\.\S+/.test(email);
     const validatePhoneNumber = (phone: string) => /^\+?[1-9]\d{1,14}$/.test(phone);
-    const validateZipCode = (zipcode: string) => /^\d{5}(?:[-\s]\d{4})?$/.test(zipcode);
+    const validateZipCode = (zipcode: string) => /^\d{4,5}(?:[-\s]\d{4})?$/.test(zipcode);
 
     if (!dewar) return <Typography>No dewar selected.</Typography>;