diff --git a/scripts/tls-alpn.nse b/scripts/tls-alpn.nse
index 67870812e..9fb005d1f 100644
--- a/scripts/tls-alpn.nse
+++ b/scripts/tls-alpn.nse
@@ -159,6 +159,10 @@ end
 action = function(host, port)
   local alpn_protos = {
     -- IANA-registered names
+    -- https://www.iana.org/assignments/tls-extensiontype-values/alpn-protocol-ids.csv
+    -- Last-Modified: Thu, 31 Oct 2019 22:30:11 GMT
+    "http/0.9",
+    "http/1.0",
     "http/1.1",
     "spdy/1",
     "spdy/2",
@@ -173,6 +177,11 @@ action = function(host, port)
     "imap",
     "pop3",
     "managesieve",
+    "coap",
+    "xmpp-client",
+    "xmpp-server",
+    "acme-tls/1",
+    "mqtt",
     -- Other sources
     "grpc-exp", -- gRPC, see grpc.io
   }