diff --git a/litellm/proxy/auth/auth_exception_handler.py b/litellm/proxy/auth/auth_exception_handler.py
index e19bb3f9f5f..bd682e98a59 100644
--- a/litellm/proxy/auth/auth_exception_handler.py
+++ b/litellm/proxy/auth/auth_exception_handler.py
@@ -94,6 +94,14 @@ class UserAPIKeyAuthExceptionHandler:
                 request=request,
                 use_x_forwarded_for=general_settings.get("use_x_forwarded_for", False),
             )
+            request_metadata = request_data.get("metadata")
+            request_data_with_ip = {
+                **request_data,
+                "metadata": {
+                    **(request_metadata if isinstance(request_metadata, dict) else {}),
+                    "requester_ip_address": requester_ip,
+                },
+            }
             verbose_proxy_logger.exception(
                 "litellm.proxy.proxy_server.user_api_key_auth(): Exception occured - {}\nRequester IP Address:{}".format(
                     str(e),
@@ -134,7 +142,7 @@ class UserAPIKeyAuthExceptionHandler:
 
             # Allow callbacks to transform the error response
             transformed_exception = await proxy_logging_obj.post_call_failure_hook(
-                request_data=request_data,
+                request_data=request_data_with_ip,
                 original_exception=e,
                 user_api_key_dict=user_api_key_dict,
                 error_type=ProxyErrorTypes.auth_error,
diff --git a/tests/test_litellm/proxy/auth/test_auth_exception_handler.py b/tests/test_litellm/proxy/auth/test_auth_exception_handler.py
index 11e6f483e35..dd1207a0946 100644
--- a/tests/test_litellm/proxy/auth/test_auth_exception_handler.py
+++ b/tests/test_litellm/proxy/auth/test_auth_exception_handler.py
@@ -423,6 +423,18 @@ async def test_auth_failure_without_resolved_identity_still_logs():
     the handler must still log a usable object carrying the raw api key and
     route, not crash on the missing identity."""
     handler = UserAPIKeyAuthExceptionHandler()
+    request = Request(
+        {
+            "type": "http",
+            "method": "POST",
+            "path": "/v1/chat/completions",
+            "headers": [],
+            "client": ("203.0.113.42", 45678),
+            "scheme": "http",
+            "server": ("testserver", 80),
+            "query_string": b"",
+        }
+    )
 
     with (
         patch(
@@ -445,7 +457,7 @@ async def test_auth_failure_without_resolved_identity_still_logs():
                     param=None,
                     code=status.HTTP_401_UNAUTHORIZED,
                 ),
-                MagicMock(),
+                request,
                 {},
                 "/v1/chat/completions",
                 None,
@@ -453,8 +465,10 @@ async def test_auth_failure_without_resolved_identity_still_logs():
             )
 
     logged = mock_hook.call_args[1]["user_api_key_dict"]
+    logged_request_data = mock_hook.call_args[1]["request_data"]
     # Raw key must NOT land on the object — it would be promoted into telemetry
     # as litellm.api_key.hash and leak a real sk-... to anyone reading the trace.
     assert logged.api_key != "sk-unknown"
     assert logged.api_key == UserAPIKeyAuth(api_key="sk-unknown").api_key
     assert logged.request_route == "/v1/chat/completions"
+    assert logged_request_data["metadata"]["requester_ip_address"] == "203.0.113.42"