diff --git a/monitoring/uss_qualifier/configurations/dev/dss_probing.yaml b/monitoring/uss_qualifier/configurations/dev/dss_probing.yaml
index 6ef5c7f17b..c83118d283 100644
--- a/monitoring/uss_qualifier/configurations/dev/dss_probing.yaml
+++ b/monitoring/uss_qualifier/configurations/dev/dss_probing.yaml
@@ -39,6 +39,18 @@ v1:
                 rid_version: F3411-22a
                 base_url: http://dss.uss2.localutm/rid/v2
                 has_private_address: true
+        utm_dss_instances_v21:  # TODO discuss if this is the right place for this? The rest seems netrid specific
+          resource_type: resources.astm.f3548.v21.DSSInstancesResource
+          dependencies:
+            auth_adapter: utm_auth
+          specification:
+            dss_instances:
+              - participant_id: uss1
+                base_url: http://dss.uss1.localutm/rid/v2 # TODO: probably different base urls here?
+                has_private_address: true
+              - participant_id: uss2
+                base_url: http://dss.uss2.localutm/rid/v2
+                has_private_address: true
         id_generator:
           resource_type: resources.interuss.IDGeneratorResource
           dependencies:
@@ -70,6 +82,7 @@ v1:
         resources:
           f3411v19_dss_instances: netrid_dss_instances_v19
           f3411v22a_dss_instances: netrid_dss_instances_v22a
+          f3548v21_dss_instances: utm_dss_instances_v21
           id_generator: id_generator
           service_area: service_area
   artifacts:
diff --git a/monitoring/uss_qualifier/resources/astm/f3548/v21/__init__.py b/monitoring/uss_qualifier/resources/astm/f3548/v21/__init__.py
index c0c50ca3fe..6da048f501 100644
--- a/monitoring/uss_qualifier/resources/astm/f3548/v21/__init__.py
+++ b/monitoring/uss_qualifier/resources/astm/f3548/v21/__init__.py
@@ -1 +1 @@
-from .dss import DSSInstanceResource
+from .dss import DSSInstanceResource, DSSInstancesResource
diff --git a/monitoring/uss_qualifier/resources/astm/f3548/v21/dss.py b/monitoring/uss_qualifier/resources/astm/f3548/v21/dss.py
index ed937b0694..e7088ad90b 100644
--- a/monitoring/uss_qualifier/resources/astm/f3548/v21/dss.py
+++ b/monitoring/uss_qualifier/resources/astm/f3548/v21/dss.py
@@ -1,4 +1,4 @@
-from typing import Tuple, List
+from typing import Tuple, List, Optional
 from urllib.parse import urlparse
 
 from implicitdict import ImplicitDict
@@ -24,6 +24,9 @@ class DSSInstanceSpecification(ImplicitDict):
     base_url: str
     """Base URL for the DSS instance according to the ASTM F3548-21 API"""
 
+    has_private_address: Optional[bool]
+    """Whether this DSS instance is expected to have a private address that is not publicly addressable."""
+
     def __init__(self, *args, **kwargs):
         super().__init__(**kwargs)
         try:
@@ -34,16 +37,20 @@ def __init__(self, *args, **kwargs):
 
 class DSSInstance(object):
     participant_id: str
+    has_private_address: bool = False
     client: infrastructure.UTMClientSession
 
     def __init__(
         self,
         participant_id: str,
         base_url: str,
+        has_private_address: Optional[bool],
         auth_adapter: infrastructure.AuthAdapter,
     ):
         self.participant_id = participant_id
         self._base_url = base_url
+        if has_private_address is not None:
+            self.has_private_address = has_private_address
         self.client = infrastructure.UTMClientSession(base_url, auth_adapter)
 
     def find_op_intent(
@@ -92,5 +99,31 @@ def __init__(
         auth_adapter: AuthAdapterResource,
     ):
         self.dss = DSSInstance(
-            specification.participant_id, specification.base_url, auth_adapter.adapter
+            specification.participant_id,
+            specification.base_url,
+            specification.has_private_address,
+            auth_adapter.adapter,
         )
+
+
+class DSSInstancesSpecification(ImplicitDict):
+    dss_instances: List[DSSInstanceSpecification]
+
+
+class DSSInstancesResource(Resource[DSSInstancesSpecification]):
+    dss_instances: List[DSSInstance]
+
+    def __init__(
+        self,
+        specification: DSSInstancesSpecification,
+        auth_adapter: AuthAdapterResource,
+    ):
+        self.dss_instances = [
+            DSSInstance(
+                s.participant_id,
+                s.base_url,
+                s.has_private_address,
+                auth_adapter.adapter,
+            )
+            for s in specification.dss_instances
+        ]
diff --git a/monitoring/uss_qualifier/scenarios/astm/utm/__init__.py b/monitoring/uss_qualifier/scenarios/astm/utm/__init__.py
index 007c2a8358..9317644cb6 100644
--- a/monitoring/uss_qualifier/scenarios/astm/utm/__init__.py
+++ b/monitoring/uss_qualifier/scenarios/astm/utm/__init__.py
@@ -5,3 +5,4 @@
 from .nominal_planning.conflict_equal_priority_not_permitted.conflict_equal_priority_not_permitted import (
     ConflictEqualPriorityNotPermitted,
 )
+from .dss_interoperability import DSSInteroperability
diff --git a/monitoring/uss_qualifier/scenarios/astm/utm/dss_interoperability.md b/monitoring/uss_qualifier/scenarios/astm/utm/dss_interoperability.md
new file mode 100644
index 0000000000..16ff85c363
--- /dev/null
+++ b/monitoring/uss_qualifier/scenarios/astm/utm/dss_interoperability.md
@@ -0,0 +1,31 @@
+# ASTM F3548-21 UTM DSS interoperability test scenario
+
+## Overview
+
+TODO: Complete with details once we check more than the prerequisites.
+
+This scenario currently only checks that all specified DSS instances are publicly addressable and reachable.
+
+## Resources
+
+### primary_dss_instance
+
+A resources.astm.f3548.v21.DSSInstanceResource containing the "primary" DSS instance for this scenario.
+
+### all_dss_instances
+
+A resources.astm.f3548.v21.DSSInstancesResource containing at least two DSS instances complying with ASTM F3548-21.
+
+## Prerequisites test case
+
+### Test environment requirements test step
+
+#### DSS instance is publicly addressable check
+
+As per **[astm.f3548.v21.DSS0300](../../../requirements/astm/f3548/v21.md)** the DSS instance should be publicly addressable.
+As such, this check will fail if the resolved IP of the DSS host is a private IP address, unless that is explicitly
+expected.
+
+#### DSS instance is reachable check
+As per **[astm.f3548.v21.DSS0300](../../../requirements/astm/f3548/v21.md)** the DSS instance should be publicly addressable.
+As such, this check will fail if the DSS is not reachable with a dummy query.
diff --git a/monitoring/uss_qualifier/scenarios/astm/utm/dss_interoperability.py b/monitoring/uss_qualifier/scenarios/astm/utm/dss_interoperability.py
new file mode 100644
index 0000000000..ca87bd6bcd
--- /dev/null
+++ b/monitoring/uss_qualifier/scenarios/astm/utm/dss_interoperability.py
@@ -0,0 +1,95 @@
+import ipaddress
+import socket
+import time
+import uuid
+from dataclasses import dataclass
+import datetime
+from enum import Enum
+from typing import List, Dict, Optional
+from urllib.parse import urlparse
+
+import s2sphere
+
+from monitoring.monitorlib.fetch.rid import ISA
+from monitoring.uss_qualifier.common_data_definitions import Severity
+from monitoring.uss_qualifier.resources.astm.f3411.dss import (
+    DSSInstancesResource,
+    DSSInstanceResource,
+)
+from monitoring.uss_qualifier.scenarios.astm.netrid.dss_wrapper import DSSWrapper
+from monitoring.uss_qualifier.scenarios.scenario import TestScenario
+
+VERTICES: List[s2sphere.LatLng] = [
+    s2sphere.LatLng.from_degrees(lng=130.6205, lat=-23.6558),
+    s2sphere.LatLng.from_degrees(lng=130.6301, lat=-23.6898),
+    s2sphere.LatLng.from_degrees(lng=130.6700, lat=-23.6709),
+    s2sphere.LatLng.from_degrees(lng=130.6466, lat=-23.6407),
+]
+SHORT_WAIT_SEC = 5
+
+
+class DSSInteroperability(
+    TestScenario
+):  # TODO needed to extend TestScenario instead of GenericTestScenario otherwise `make format` is unhappy
+    _dss_primary: DSSWrapper
+    _dss_others: List[DSSWrapper]
+
+    def __init__(
+        self,
+        primary_dss_instance: DSSInstanceResource,
+        all_dss_instances: DSSInstancesResource,
+    ):
+        super().__init__()
+        self._dss_primary = DSSWrapper(self, primary_dss_instance.dss_instance)
+        self._dss_others = [
+            DSSWrapper(self, dss)
+            for dss in all_dss_instances.dss_instances
+            if not dss.is_same_as(primary_dss_instance.dss_instance)
+        ]
+
+    def run(self):
+
+        self.record_note(
+            "dss_instances",
+            f"Provided DSS instances: {[self._dss_primary] + self._dss_others}",
+        )
+        self.begin_test_scenario()
+
+        self.begin_test_case("Prerequisites")
+
+        self.begin_test_step("Test environment requirements")
+        self._test_env_reqs()
+        self.end_test_step()
+
+        self.end_test_case()
+
+        self.end_test_scenario()
+
+    def _test_env_reqs(self):
+        for dss in [self._dss_primary] + self._dss_others:
+            with self.check(
+                "DSS instance is publicly addressable", [dss.participant_id]
+            ) as check:
+                parsed_url = urlparse(dss.base_url)
+                ip_addr = socket.gethostbyname(parsed_url.hostname)
+
+                if dss.has_private_address:
+                    self.record_note(
+                        f"{dss.participant_id}_private_address",
+                        f"DSS instance (URL: {dss.base_url}, netloc: {parsed_url.netloc}, resolved IP: {ip_addr}) is declared as explicitly having a private address, skipping check",
+                    )
+                elif ipaddress.ip_address(ip_addr).is_private:
+                    check.record_failed(
+                        summary=f"DSS host {parsed_url.netloc} is not publicly addressable",
+                        severity=Severity.Medium,
+                        participants=[dss.participant_id],
+                        details=f"DSS (URL: {dss.base_url}, netloc: {parsed_url.netloc}, resolved IP: {ip_addr}) is not publicly addressable",
+                    )
+
+            with self.check("DSS instance is reachable", [dss.participant_id]) as check:
+                # dummy search query
+                dss.search_subs(check, VERTICES)
+
+    def cleanup(self):
+        self.begin_cleanup()
+        self.end_cleanup()
diff --git a/monitoring/uss_qualifier/suites/astm/utm/f3548_21.md b/monitoring/uss_qualifier/suites/astm/utm/f3548_21.md
index 9b83332c44..91c251e487 100644
--- a/monitoring/uss_qualifier/suites/astm/utm/f3548_21.md
+++ b/monitoring/uss_qualifier/suites/astm/utm/f3548_21.md
@@ -4,11 +4,12 @@
 
 ## [Actions](../../README.md#actions)
 
-1. Action generator: [`action_generators.flight_planning.FlightPlannerCombinations`](../../../action_generators/flight_planning/planner_combinations.py)
-    1. Scenario: [Validation of operational intents](../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md) ([`scenarios.astm.utm.FlightIntentValidation`](../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.py))
+1. Scenario: [ASTM F3548-21 UTM DSS interoperability](../../../scenarios/astm/utm/dss_interoperability.md) ([`scenarios.astm.utm.DSSInteroperability`](../../../scenarios/astm/utm/dss_interoperability.py))
 2. Action generator: [`action_generators.flight_planning.FlightPlannerCombinations`](../../../action_generators/flight_planning/planner_combinations.py)
-    1. Scenario: [Nominal planning: conflict with higher priority](../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md) ([`scenarios.astm.utm.ConflictHigherPriority`](../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.py))
+    1. Scenario: [Validation of operational intents](../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md) ([`scenarios.astm.utm.FlightIntentValidation`](../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.py))
 3. Action generator: [`action_generators.flight_planning.FlightPlannerCombinations`](../../../action_generators/flight_planning/planner_combinations.py)
+    1. Scenario: [Nominal planning: conflict with higher priority](../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md) ([`scenarios.astm.utm.ConflictHigherPriority`](../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.py))
+4. Action generator: [`action_generators.flight_planning.FlightPlannerCombinations`](../../../action_generators/flight_planning/planner_combinations.py)
     1. Scenario: [Nominal planning: not permitted conflict with equal priority](../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md) ([`scenarios.astm.utm.ConflictEqualPriorityNotPermitted`](../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.py))
 
 ## [Checked requirements](../../README.md#checked-requirements)
@@ -21,11 +22,16 @@
     <th><a href="../../README.md#checked-in">Checked in</a></th>
   </tr>
   <tr>
-    <td rowspan="18" style="vertical-align:top;"><a href="../../../requirements/astm/f3548/v21.md">astm<br>.f3548<br>.v21</a></td>
+    <td rowspan="19" style="vertical-align:top;"><a href="../../../requirements/astm/f3548/v21.md">astm<br>.f3548<br>.v21</a></td>
     <td><a href="../../../requirements/astm/f3548/v21.md">DSS0005</a></td>
     <td>Implemented</td>
     <td><a href="../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
+  <tr>
+    <td><a href="../../../requirements/astm/f3548/v21.md">DSS0300</a></td>
+    <td>Implemented</td>
+    <td><a href="../../../scenarios/astm/utm/dss_interoperability.md">ASTM F3548-21 UTM DSS interoperability</a></td>
+  </tr>
   <tr>
     <td><a href="../../../requirements/astm/f3548/v21.md">GEN0310</a></td>
     <td>Implemented</td>
diff --git a/monitoring/uss_qualifier/suites/astm/utm/f3548_21.yaml b/monitoring/uss_qualifier/suites/astm/utm/f3548_21.yaml
index 51380c2746..ec85035680 100644
--- a/monitoring/uss_qualifier/suites/astm/utm/f3548_21.yaml
+++ b/monitoring/uss_qualifier/suites/astm/utm/f3548_21.yaml
@@ -2,12 +2,18 @@ name: ASTM F3548-21
 resources:
   flight_planners: resources.flight_planning.FlightPlannersResource
   dss: resources.astm.f3548.v21.DSSInstanceResource
+  all_dss_instances: resources.astm.f3548.DSSInstancesResource?
   conflicting_flights: resources.flight_planning.FlightIntentsResource
   priority_preemption_flights: resources.flight_planning.FlightIntentsResource
   invalid_flight_intents: resources.flight_planning.FlightIntentsResource
   nominal_planning_selector: resources.flight_planning.FlightPlannerCombinationSelectorResource?
   priority_planning_selector: resources.flight_planning.FlightPlannerCombinationSelectorResource?
 actions:
+- test_scenario:  # TODO confirm this should go here
+    scenario_type: scenarios.astm.utm.DSSInteroperability
+    resources:
+      primary_dss_instance: dss
+      all_dss_instances: all_dss_instances
 - action_generator:
     generator_type: action_generators.flight_planning.FlightPlannerCombinations
     resources:
diff --git a/monitoring/uss_qualifier/suites/faa/uft/message_signing.md b/monitoring/uss_qualifier/suites/faa/uft/message_signing.md
index 050dde31a4..4296159689 100644
--- a/monitoring/uss_qualifier/suites/faa/uft/message_signing.md
+++ b/monitoring/uss_qualifier/suites/faa/uft/message_signing.md
@@ -18,11 +18,16 @@
     <th><a href="../../README.md#checked-in">Checked in</a></th>
   </tr>
   <tr>
-    <td rowspan="18" style="vertical-align:top;"><a href="../../../requirements/astm/f3548/v21.md">astm<br>.f3548<br>.v21</a></td>
+    <td rowspan="19" style="vertical-align:top;"><a href="../../../requirements/astm/f3548/v21.md">astm<br>.f3548<br>.v21</a></td>
     <td><a href="../../../requirements/astm/f3548/v21.md">DSS0005</a></td>
     <td>Implemented</td>
     <td><a href="../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
+  <tr>
+    <td><a href="../../../requirements/astm/f3548/v21.md">DSS0300</a></td>
+    <td>Implemented</td>
+    <td><a href="../../../scenarios/astm/utm/dss_interoperability.md">ASTM F3548-21 UTM DSS interoperability</a></td>
+  </tr>
   <tr>
     <td><a href="../../../requirements/astm/f3548/v21.md">GEN0310</a></td>
     <td>Implemented</td>
diff --git a/monitoring/uss_qualifier/suites/interuss/dss/all_tests.yaml b/monitoring/uss_qualifier/suites/interuss/dss/all_tests.yaml
index b8fad053be..0c33ce19c7 100644
--- a/monitoring/uss_qualifier/suites/interuss/dss/all_tests.yaml
+++ b/monitoring/uss_qualifier/suites/interuss/dss/all_tests.yaml
@@ -2,6 +2,7 @@ name: ASTM DSS tests
 resources:
   f3411v19_dss_instances: resources.astm.f3411.DSSInstancesResource
   f3411v22a_dss_instances: resources.astm.f3411.DSSInstancesResource
+  f3548v21_dss_instances: resources.astm.f3548.v21.DSSInstancesResource
   id_generator: resources.interuss.IDGeneratorResource
   service_area: resources.netrid.ServiceAreaResource
 actions:
diff --git a/monitoring/uss_qualifier/suites/uspace/flight_auth.md b/monitoring/uss_qualifier/suites/uspace/flight_auth.md
index f7dd88ba0a..659b1a805d 100644
--- a/monitoring/uss_qualifier/suites/uspace/flight_auth.md
+++ b/monitoring/uss_qualifier/suites/uspace/flight_auth.md
@@ -18,11 +18,16 @@
     <th><a href="../README.md#checked-in">Checked in</a></th>
   </tr>
   <tr>
-    <td rowspan="18" style="vertical-align:top;"><a href="../../requirements/astm/f3548/v21.md">astm<br>.f3548<br>.v21</a></td>
+    <td rowspan="19" style="vertical-align:top;"><a href="../../requirements/astm/f3548/v21.md">astm<br>.f3548<br>.v21</a></td>
     <td><a href="../../requirements/astm/f3548/v21.md">DSS0005</a></td>
     <td>Implemented</td>
     <td><a href="../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
+  <tr>
+    <td><a href="../../requirements/astm/f3548/v21.md">DSS0300</a></td>
+    <td>Implemented</td>
+    <td><a href="../../scenarios/astm/utm/dss_interoperability.md">ASTM F3548-21 UTM DSS interoperability</a></td>
+  </tr>
   <tr>
     <td><a href="../../requirements/astm/f3548/v21.md">GEN0310</a></td>
     <td>Implemented</td>
diff --git a/monitoring/uss_qualifier/suites/uspace/required_services.md b/monitoring/uss_qualifier/suites/uspace/required_services.md
index a690bb7ab8..7997e33f9c 100644
--- a/monitoring/uss_qualifier/suites/uspace/required_services.md
+++ b/monitoring/uss_qualifier/suites/uspace/required_services.md
@@ -388,11 +388,16 @@
     <td><a href="../../scenarios/astm/netrid/v22a/dss/isa_simple.md">ASTM NetRID DSS: Simple ISA</a></td>
   </tr>
   <tr>
-    <td rowspan="18" style="vertical-align:top;"><a href="../../requirements/astm/f3548/v21.md">astm<br>.f3548<br>.v21</a></td>
+    <td rowspan="19" style="vertical-align:top;"><a href="../../requirements/astm/f3548/v21.md">astm<br>.f3548<br>.v21</a></td>
     <td><a href="../../requirements/astm/f3548/v21.md">DSS0005</a></td>
     <td>Implemented</td>
     <td><a href="../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
+  <tr>
+    <td><a href="../../requirements/astm/f3548/v21.md">DSS0300</a></td>
+    <td>Implemented</td>
+    <td><a href="../../scenarios/astm/utm/dss_interoperability.md">ASTM F3548-21 UTM DSS interoperability</a></td>
+  </tr>
   <tr>
     <td><a href="../../requirements/astm/f3548/v21.md">GEN0310</a></td>
     <td>Implemented</td>