diff --git a/CHANGES/1238.bugfix b/CHANGES/1238.bugfix
new file mode 100644
index 00000000..7f5e19d8
--- /dev/null
+++ b/CHANGES/1238.bugfix
@@ -0,0 +1 @@
+Fixed blocklist entries API to support `isnull` filter lookup on `version` to uniquely identify name-only entries.
diff --git a/pulp_python/app/viewsets.py b/pulp_python/app/viewsets.py
index e27bd76f..58a41187 100644
--- a/pulp_python/app/viewsets.py
+++ b/pulp_python/app/viewsets.py
@@ -260,7 +260,7 @@ class PythonBlocklistEntryViewSet(
     parent_lookup_kwargs = {"repository_pk": "repository__pk"}
     serializer_class = python_serializers.PythonBlocklistEntrySerializer
     queryset = python_models.PythonBlocklistEntry.objects.all()
-    filterset_fields = {"name": ["exact"], "version": ["exact"], "filename": ["exact"]}
+    filterset_fields = {"name": ["exact"], "version": ["exact", "isnull"], "filename": ["exact"]}
     ordering = ("-pulp_created",)
 
     DEFAULT_ACCESS_POLICY = {