diff --git a/v2rayN/ServiceLib/Common/Utils.cs b/v2rayN/ServiceLib/Common/Utils.cs
index c5b670cf..63540ee2 100644
--- a/v2rayN/ServiceLib/Common/Utils.cs
+++ b/v2rayN/ServiceLib/Common/Utils.cs
@@ -390,13 +390,44 @@ public class Utils
     {
         if (IPAddress.TryParse(ip, out var address))
         {
+            // Loopback address check (127.0.0.1 for IPv4, ::1 for IPv6)
+            if (IPAddress.IsLoopback(address))
+                return true;
+
             var ipBytes = address.GetAddressBytes();
-            if (ipBytes[0] == 10)
-                return true;
-            if (ipBytes[0] == 172 && ipBytes[1] >= 16 && ipBytes[1] <= 31)
-                return true;
-            if (ipBytes[0] == 192 && ipBytes[1] == 168)
-                return true;
+            if (address.AddressFamily == AddressFamily.InterNetwork)
+            {
+                // IPv4 private address check
+                if (ipBytes[0] == 10)
+                    return true;
+                if (ipBytes[0] == 172 && ipBytes[1] >= 16 && ipBytes[1] <= 31)
+                    return true;
+                if (ipBytes[0] == 192 && ipBytes[1] == 168)
+                    return true;
+            }
+            else if (address.AddressFamily == AddressFamily.InterNetworkV6)
+            {
+                // IPv6 private address check
+                // Link-local address fe80::/10
+                if (ipBytes[0] == 0xfe && (ipBytes[1] & 0xc0) == 0x80)
+                    return true;
+                
+                // Unique local address fc00::/7 (typically fd00::/8)
+                if ((ipBytes[0] & 0xfe) == 0xfc)
+                    return true;
+                
+                // Private portion in IPv4-mapped addresses ::ffff:0:0/96
+                if (address.IsIPv4MappedToIPv6)
+                {
+                    var ipv4Bytes = ipBytes.Skip(12).ToArray();
+                    if (ipv4Bytes[0] == 10)
+                        return true;
+                    if (ipv4Bytes[0] == 172 && ipv4Bytes[1] >= 16 && ipv4Bytes[1] <= 31)
+                        return true;
+                    if (ipv4Bytes[0] == 192 && ipv4Bytes[1] == 168)
+                        return true;
+                }
+            }
         }
 
         return false;