diff --git a/library/Native_Functions.ttcn b/library/Native_Functions.ttcn
index ac62161..31bc767 100644
--- a/library/Native_Functions.ttcn
+++ b/library/Native_Functions.ttcn
@@ -1,4 +1,12 @@
 module Native_Functions {
 
+	/* direct import of inet_addr() C function, returns net byte order */
 	external function f_inet_addr(in charstring ch) return octetstring;
+	/* like inet_addr() but return is host byte order */
+	external function f_inet_haddr(in charstring ch) return octetstring;
+
+	/* direct import of inet_ntoa() C function, input net byte order */
+	external function f_inet_ntoa(in octetstring oct) return charstring;
+	/* like inet_ntoa() but input is host byte order */
+	external function f_inet_hntoa(in octetstring oct) return charstring;
 }