diff --git a/src/mqtt.js b/src/mqtt.js
index 032b9bc..162fc59 100644
--- a/src/mqtt.js
+++ b/src/mqtt.js
@@ -816,6 +816,8 @@ client.on("message", async (topic, message) => {
                     || portnum === 65 // ignore STORE_FORWARD_APP
                     || portnum === 66 // ignore RANGE_TEST_APP
                     || portnum === 72 // ignore ATAK_PLUGIN
+                    || portnum === 257 // ignore ATAK_FORWARDER
+                    || portnum > 511 // ignore above MAX
                 ){
                     return;
                 }