diff --git a/modules/core/karrio/server/core/serializers.py b/modules/core/karrio/server/core/serializers.py
index faf9fd2cca..53c0a517f1 100644
--- a/modules/core/karrio/server/core/serializers.py
+++ b/modules/core/karrio/server/core/serializers.py
@@ -861,6 +861,15 @@ class TrackingData(serializers.Serializer):
         required=True,
         help_text="The tracking carrier",
     )
+    carrier_id = serializers.CharField(
+        required=False,
+        allow_blank=False,
+        allow_null=True,
+        help_text=(
+            "Optional carrier connection identifier (connection id or carrier_id). "
+            "Useful when multiple connections exist for the same carrier."
+        ),
+    )
     account_number = serializers.CharField(
         required=False,
         allow_blank=True,
diff --git a/modules/manager/karrio/server/manager/serializers/tracking.py b/modules/manager/karrio/server/manager/serializers/tracking.py
index f48bbc40f3..ff61a2b1c9 100644
--- a/modules/manager/karrio/server/manager/serializers/tracking.py
+++ b/modules/manager/karrio/server/manager/serializers/tracking.py
@@ -47,7 +47,14 @@ class TrackingSerializer(TrackingDetails):
     def create(self, validated_data: dict, context, **kwargs) -> models.Tracking:
         options = validated_data["options"]
         metadata = validated_data["metadata"]
-        carrier_filter = validated_data["carrier_filter"]
+        carrier_filter = {
+            **validated_data["carrier_filter"],
+            **(
+                {"carrier_id": validated_data["carrier_id"]}
+                if validated_data.get("carrier_id")
+                else {}
+            ),
+        }
         tracking_number = validated_data["tracking_number"]
         account_number = validated_data.get("account_number")
         info = validated_data.get("info")
diff --git a/modules/manager/karrio/server/manager/tests/test_trackers.py b/modules/manager/karrio/server/manager/tests/test_trackers.py
index 0f897a4321..65870d56cd 100644
--- a/modules/manager/karrio/server/manager/tests/test_trackers.py
+++ b/modules/manager/karrio/server/manager/tests/test_trackers.py
@@ -44,6 +44,33 @@ def test_shipment_tracking_retry(self):
         self.assertDictEqual(response_data, TRACKING_RESPONSE)
         self.assertEqual(len(self.user.tracking_set.all()), 1)
 
+    def test_create_tracker_with_carrier_id(self):
+        url = reverse("karrio.server.manager:trackers-list")
+        data = dict(
+            tracking_number="1Z12345E6205277936",
+            carrier_name="ups",
+            carrier_id="ups_domestic",
+        )
+
+        with patch(
+            "karrio.server.manager.serializers.tracking.Connections.first"
+        ) as connection_mock, patch("karrio.server.core.gateway.utils.identity") as mock:
+            connection_mock.return_value = self.ups_carrier
+            mock.return_value = RETURNED_VALUE
+
+            response = self.client.post(url, data)
+
+            self.assertResponseNoErrors(response)
+            self.assertEqual(response.status_code, status.HTTP_202_ACCEPTED)
+            connection_mock.assert_called_once_with(
+                context=ANY,
+                raise_not_found=True,
+                active=True,
+                capability="tracking",
+                carrier_name="ups",
+                carrier_id="ups_domestic",
+            )
+
 
 class TestTrackersUpdate(APITestCase):
     def setUp(self) -> None:
diff --git a/modules/proxy/karrio/server/proxy/tests/test_tracking.py b/modules/proxy/karrio/server/proxy/tests/test_tracking.py
index ac3ce4c2ea..edad6ad053 100644
--- a/modules/proxy/karrio/server/proxy/tests/test_tracking.py
+++ b/modules/proxy/karrio/server/proxy/tests/test_tracking.py
@@ -3,10 +3,17 @@
 from django.urls import reverse
 from rest_framework import status
 from karrio.core.models import TrackingDetails, TrackingEvent
+from karrio.server.core.serializers import TrackingData
 from karrio.server.core.tests import APITestCase
 
 
 class TestTracking(APITestCase):
+    def test_tracking_data_accepts_carrier_id_without_test_mode_body_field(self):
+        fields = TrackingData().fields
+
+        self.assertIn("carrier_id", fields)
+        self.assertNotIn("test_mode", fields)
+
     def test_tracking_shipment(self):
         url = reverse("karrio.server.proxy:get-tracking")
         data = dict(tracking_number="1Z12345E6205277936", carrier_name="ups")
@@ -19,6 +26,32 @@ def test_tracking_shipment(self):
             self.assertEqual(response.status_code, status.HTTP_200_OK)
             self.assertDictEqual(response_data, TRACKING_RESPONSE)
 
+    def test_tracking_shipment_with_carrier_id(self):
+        url = reverse("karrio.server.proxy:get-tracking")
+        data = dict(
+            tracking_number="1Z12345E6205277936",
+            carrier_name="ups",
+            carrier_id="ups_domestic",
+        )
+
+        with patch("karrio.server.core.gateway.Carriers.first") as carrier_mock, patch(
+            "karrio.server.core.gateway.utils.identity"
+        ) as mock:
+            carrier_mock.return_value = self.ups_carrier
+            mock.return_value = RETURNED_VALUE
+
+            response = self.client.post(url, data)
+
+            self.assertEqual(response.status_code, status.HTTP_200_OK)
+            carrier_mock.assert_called_once_with(
+                active=True,
+                capability="tracking",
+                raise_not_found=True,
+                context=ANY,
+                carrier_name="ups",
+                carrier_id="ups_domestic",
+            )
+
 
 RETURNED_VALUE = [
     [
diff --git a/modules/proxy/karrio/server/proxy/views/tracking.py b/modules/proxy/karrio/server/proxy/views/tracking.py
index 44a2e2f9de..2fbdccd6ac 100644
--- a/modules/proxy/karrio/server/proxy/views/tracking.py
+++ b/modules/proxy/karrio/server/proxy/views/tracking.py
@@ -57,6 +57,8 @@ def post(self, request: Request):
                 query.get("hub") if "hub" in query else data["carrier_name"]
             ),
         }
+        if data.get("carrier_id"):
+            carrier_filter["carrier_id"] = data["carrier_id"]
         data = {
             **data,
             "tracking_numbers": [data["tracking_number"]],