diff --git a/parsedmarc/utils.py b/parsedmarc/utils.py
index ae056f2..0de7825 100644
--- a/parsedmarc/utils.py
+++ b/parsedmarc/utils.py
@@ -345,7 +345,9 @@ def get_service_from_reverse_dns_base_domain(
     if not (offline or always_use_local_file) and len(reverse_dns_map) == 0:
         try:
             logger.debug(f"Trying to fetch reverse DNS map from {url}...")
-            csv_file.write(requests.get(url).text)
+            response = requests.get(url)
+            response.raise_for_status()
+            csv_file.write(response.text)
             csv_file.seek(0)
             load_csv(csv_file)
         except requests.exceptions.RequestException as e: