diff --git a/library/MSLookup_mDNS_Types.ttcn b/library/MSLookup_mDNS_Types.ttcn
new file mode 100644
index 0000000..dacbb2b
--- /dev/null
+++ b/library/MSLookup_mDNS_Types.ttcn
@@ -0,0 +1,31 @@
+module MSLookup_mDNS_Types {
+
+/* (C) 2020 sysmocom s.f.m.c. GmbH <info@sysmocom.de>
+ * All rights reserved.
+ *
+ * Released under the terms of GNU General Public License, Version 2 or
+ * (at your option) any later version.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+import from DNS_Types all;
+import from UDPasp_Types all;
+import from UDPasp_PortType all;
+
+type record MSLookup_mDNS {
+	PDU_DNS       dnsMessage,
+	AddressType   udpAddress,
+	PortType      udpPort
+}
+
+type port MSLookup_mDNS_PT message {
+	inout MSLookup_mDNS
+} with { extension "internal" }
+
+type component MSLookup_mDNS_Emulation_CT {
+	port MSLookup_mDNS_PT mDNS;
+	port UDPasp_PT mDNS_UDP;
+}
+
+}