diff --git a/tracker-radar-tests/TR-domain-matching/domain_matching_tests.json b/tracker-radar-tests/TR-domain-matching/domain_matching_tests.json
index 2aadc47a..72753cfe 100644
--- a/tracker-radar-tests/TR-domain-matching/domain_matching_tests.json
+++ b/tracker-radar-tests/TR-domain-matching/domain_matching_tests.json
@@ -80,7 +80,7 @@
                 "expectAction": "block"
             },
             {
-                "name": "uncloacked tracker should contain original path and be checked against the ignore rules",
+                "name": "uncloaked tracker should contain original path and be checked against the ignore rules",
                 "siteURL": "https://randomsite123.com/",
                 "requestURL": "https://bad.cnames.test/breakage",
                 "requestType": "script",
@@ -219,6 +219,27 @@
                     "ios-browser",
                     "web-extension-mv3"
                 ]
+            },
+            {
+                "name": "unknown site default action results in default behavior",
+                "siteURL": "https://random678.site/",
+                "requestURL": "https://unknown-action.site/",
+                "requestType": "script",
+                "expectAction": "ignore"
+            },
+            {
+                "name": "unknown rule action results in default ignore behavior",
+                "siteURL": "https://random.test/",
+                "requestURL": "action.ignore.test/tracker",
+                "requestType": "script",
+                "expectAction": null
+            },
+            {
+                "name": "unknown rule action results in default block behavior",
+                "siteURL": "https://random678.site/",
+                "requestURL": "https://tracker.test/new-new-thing/",
+                "requestType": "script",
+                "expectAction": "block"
             }
         ]
     },
diff --git a/tracker-radar-tests/TR-domain-matching/tracker_radar_reference.json b/tracker-radar-tests/TR-domain-matching/tracker_radar_reference.json
index 5a9f5689..ce7039ee 100644
--- a/tracker-radar-tests/TR-domain-matching/tracker_radar_reference.json
+++ b/tracker-radar-tests/TR-domain-matching/tracker_radar_reference.json
@@ -63,6 +63,10 @@
                 {
                     "action": "ignore",
                     "rule": "tracker\\.test\\/breakage"
+                },
+                {
+                    "rule": "tracker\\.test\\/new-new-thing",
+                    "action": "ignore-unknown-action"
                 }
             ]
         },
@@ -82,6 +86,10 @@
             "rules": [
                 {
                     "rule": "ignore\\.test\\/tracker"
+                },
+                {
+                    "rule": "action\\.ignore\\.test\\/tracker",
+                    "action": "ignore-unknown-action"
                 }
             ]
         },
@@ -138,6 +146,21 @@
                 }
             ],
             "default": "block"
+        },
+        "unknown-action.site": {
+            "domain": "unknown-action.site",
+            "owner": {
+                "name": "Ignore Site for Tracker Blocking",
+                "displayName": "Ignore unknown actions",
+                "privacyPolicy": "",
+                "url": "http://unknown-action.site"
+            },
+            "prevalence": 0.1,
+            "fingerprinting": 3,
+            "cookies": 0.1,
+            "categories": [],
+            "rules": [],
+            "default": "ignore-unknown-action"
         }
     },
     "entities": {
@@ -154,7 +177,8 @@
         "Ignore Site for Tracker Blocking": {
             "domains": [
                 "ignore.test",
-                "sub.ignore.test"
+                "sub.ignore.test",
+                "unknown-action.site"
             ],
             "prevalence": 0.1,
             "displayName": "Ignore Site for Tracker Blocking"
@@ -183,6 +207,7 @@
         "sub.ignore.test": "Ignore Site for Tracker Blocking",
         "surrogates.test": "Test Site for Surrogates",
         "other-surrogates.test": "Test Site for Surrogates",
-        "blockedsurrogates.test": "Test Site for Surrogates"
+        "blockedsurrogates.test": "Test Site for Surrogates",
+        "unknown-action.site": "Ignore Site for Tracker Blocking"
     }
 }