diff --git a/bbot/test/test_step_2/module_tests/test_module_nmap.py b/bbot/test/test_step_2/module_tests/test_module_nmap.py
index 58bb801d1..594464236 100644
--- a/bbot/test/test_step_2/module_tests/test_module_nmap.py
+++ b/bbot/test/test_step_2/module_tests/test_module_nmap.py
@@ -2,9 +2,23 @@
 
 
 class TestNmap(ModuleTestBase):
-    targets = ["127.0.0.1"]
+    targets = ["127.0.0.1/31"]
     config_overrides = {"modules": {"nmap": {"ports": "8888,8889"}}}
 
+    async def setup_after_prep(self, module_test):
+        # make sure our IP_RANGE / IP_ADDRESS filtering is working right
+        # IPs within the target IP range should be rejected
+        ip_event_1 = module_test.scan.make_event("127.0.0.0", source=module_test.scan.root_event)
+        ip_event_1.scope_distance = 0
+        assert (await module_test.module._event_postcheck(ip_event_1)) == (
+            False,
+            "it did not meet custom filter criteria: Skipping 127.0.0.0 because it is already included in 127.0.0.0/31",
+        )
+        # but ones outside should be accepted
+        ip_event_2 = module_test.scan.make_event("127.0.0.3", source=module_test.scan.root_event)
+        ip_event_2.scope_distance = 0
+        assert (await module_test.module._event_postcheck(ip_event_2))[0] == True
+
     def check(self, module_test, events):
-        assert any(e.data == "127.0.0.1:8888" for e in events)
+        assert 1 == len([e for e in events if e.data == "127.0.0.1:8888"])
         assert not any(e.data == "127.0.0.1:8889" for e in events)