diff --git a/library/DNS_Helpers.ttcn b/library/DNS_Helpers.ttcn
index 122adff..85040fc 100644
--- a/library/DNS_Helpers.ttcn
+++ b/library/DNS_Helpers.ttcn
@@ -70,4 +70,27 @@
 }
 
 
+function f_enc_IPv4(charstring str) return octetstring {
+	var octetstring ret := ''O;
+
+	while (lengthof(str) > 0) {
+		var integer dot_idx;
+		var charstring num;
+
+		dot_idx := f_strchr(str, ".");
+		if (dot_idx >= 0) {
+			/* there is another dot */
+			num := substr(str, 0, dot_idx);
+			str := substr(str, dot_idx+1, lengthof(str)-dot_idx-1);
+		} else {
+			/* no more dot */
+			num := str;
+			str := "";
+		}
+		ret := ret & int2oct(str2int(num), 1);
+	}
+
+	return ret;
+}
+
 }