diff --git a/internal/module/test/tcp-server_test.go b/internal/module/test/tcp-server_test.go
index 2360a28..c2b22f4 100644
--- a/internal/module/test/tcp-server_test.go
+++ b/internal/module/test/tcp-server_test.go
@@ -88,6 +88,15 @@ func TestBadTCPServer(t *testing.T) {
 			},
 			errorString: "net.tcp.server ip must be a string",
 		},
+		{
+			name: "invalid addr",
+			params: map[string]any{
+				"ip":      "127.0.0.",
+				"port":    8000.0,
+				"framing": "LF",
+			},
+			errorString: "lookup 127.0.0.: no such host",
+		},
 	}
 
 	for _, test := range tests {
diff --git a/internal/module/test/udp-multicast_test.go b/internal/module/test/udp-multicast_test.go
index 937a018..686fcd6 100644
--- a/internal/module/test/udp-multicast_test.go
+++ b/internal/module/test/udp-multicast_test.go
@@ -71,6 +71,14 @@ func TestBadUDPMulticast(t *testing.T) {
 			},
 			errorString: "net.udp.multicast ip must be a string",
 		},
+		{
+			name: "invalid addr",
+			params: map[string]any{
+				"ip":   "127.0.0.",
+				"port": 8000.0,
+			},
+			errorString: "lookup 127.0.0.: no such host",
+		},
 	}
 
 	for _, test := range tests {
diff --git a/internal/module/test/udp-server_test.go b/internal/module/test/udp-server_test.go
index 5e35329..ccad2b6 100644
--- a/internal/module/test/udp-server_test.go
+++ b/internal/module/test/udp-server_test.go
@@ -68,6 +68,14 @@ func TestBadUDPServer(t *testing.T) {
 			},
 			errorString: "net.udp.server bufferSize must be a number",
 		},
+		{
+			name: "invalid addr",
+			params: map[string]any{
+				"ip":   "127.0.0.",
+				"port": 8000.0,
+			},
+			errorString: "lookup 127.0.0.: no such host",
+		},
 	}
 
 	for _, test := range tests {