diff --git a/proton-checker.py b/proton-checker.py
index 7197ba7..3189de6 100644
--- a/proton-checker.py
+++ b/proton-checker.py
@@ -56,9 +56,12 @@ if __name__ == "__main__":
   # Write to rbldnsd-compliant file
   with open(output_file, "w") as f:
     f.write(":127.0.0.4:Listed, see https://protonvpn.com\n")  # Header
-    for ip_range, (country_code, server_names) in ip_range_groups.items():
+    # Iterate through IP ranges in sorted order
+    for ip_range in sorted(ip_range_groups.keys()):
+      country_code, server_names = ip_range_groups[ip_range]
       f.write(f"{ip_range}  ; ProtonVPN {country_code}\n")
 
+
 # Calculate and print stats
   total_ranges = len(ip_range_groups)
   ranges_per_country = Counter(country_code for country_code, _ in ip_range_groups.values())