diff --git a/src/main/java/com/lion/lionwebsite/Service/SubService.java b/src/main/java/com/lion/lionwebsite/Service/SubService.java
index 7ff848d..d779ce5 100644
--- a/src/main/java/com/lion/lionwebsite/Service/SubService.java
+++ b/src/main/java/com/lion/lionwebsite/Service/SubService.java
@@ -188,12 +188,7 @@ public class SubService {
             sendStatus(response, HttpServletResponse.SC_NOT_FOUND, "subscription not found");
             return;
         }
-        String ip = request.getRemoteAddr();
-        if ("127.0.0.1".equals(ip)) {
-            ip = request.getHeader("X-Forwarded-For");
-            if (ip != null && ip.contains(",")) ip = ip.split(",")[0].trim();
-            if (ip != null && ip.contains(":")) ip = ip.split(":")[0].trim();
-        }
+        String ip = resolveClientIp(request);
         String ua = request.getHeader("User-Agent");
         if (ua == null) return;
         recordUpdate(subBind.getUser(), ip, ua);
@@ -209,6 +204,31 @@ public class SubService {
         FileDownload.export(request, response, path.toString());
     }
 
+    private static String resolveClientIp(HttpServletRequest request) {
+        String remoteAddr = headerAddress(request.getRemoteAddr());
+        if (isLoopback(remoteAddr)) {
+            String forwardedFor = headerAddress(request.getHeader("X-Forwarded-For"));
+            if (forwardedFor != null)
+                return forwardedFor;
+            String realIp = headerAddress(request.getHeader("X-Real-IP"));
+            if (realIp != null)
+                return realIp;
+        }
+        return remoteAddr == null ? "unknown" : remoteAddr;
+    }
+
+    private static String headerAddress(String value) {
+        if (value == null || value.isBlank())
+            return null;
+        String address = value.split(",", 2)[0].trim();
+        return address.isBlank() || "unknown".equalsIgnoreCase(address) ? null : address;
+    }
+
+    private static boolean isLoopback(String address) {
+        return "127.0.0.1".equals(address) || "::1".equals(address)
+                || "0:0:0:0:0:0:0:1".equals(address);
+    }
+
     private void recordUpdate(String user, String ip, String ua) {
         String location;
         try {