diff --git a/cmd/goflow2/mapping.yaml b/cmd/goflow2/mapping.yaml
index ae3e8af..84ab5d4 100644
--- a/cmd/goflow2/mapping.yaml
+++ b/cmd/goflow2/mapping.yaml
@@ -6,6 +6,10 @@ ipfix:
       destination: CustomInteger2
       # penprovided: false
       # pen: 0
+    - field: 137
+      destination: CustomList_1
+      penprovided: true
+      pen: 2636
 netflowv9:
   mapping:
     - field: 7
diff --git a/format/common/text.go b/format/common/text.go
index c1c68f0..d97ed68 100644
--- a/format/common/text.go
+++ b/format/common/text.go
@@ -220,6 +220,17 @@ func FormatMessageReflectCustom(msg interface{}, ext, quotes, sep, sign string,
 				switch fieldValue.Kind() {
 				case reflect.String:
 					fstr[i] = fmt.Sprintf("%s%s%s%s%q", quotes, s, quotes, sign, fieldValue.Interface())
+				case reflect.Slice:
+					c := fieldValue.Len()
+					v := "["
+					for i := 0; i < c; i++ {
+						v += fmt.Sprintf("%v", fieldValue.Index(i).Interface())
+						if i < c-1 {
+							v += ","
+						}
+					}
+					v += "]"
+					fstr[i] = fmt.Sprintf("%s%s%s%s%s", quotes, s, quotes, sign, v)
 				default:
 					fstr[i] = fmt.Sprintf("%s%s%s%s%v", quotes, s, quotes, sign, fieldValue.Interface())
 				}
diff --git a/pb/flow.pb.go b/pb/flow.pb.go
index e3ed881..4b3402c 100644
--- a/pb/flow.pb.go
+++ b/pb/flow.pb.go
@@ -158,16 +158,17 @@ type FlowMessage struct {
 	ObservationDomainId uint32 `protobuf:"varint,70,opt,name=observation_domain_id,json=observationDomainId,proto3" json:"observation_domain_id,omitempty"`
 	ObservationPointId  uint32 `protobuf:"varint,71,opt,name=observation_point_id,json=observationPointId,proto3" json:"observation_point_id,omitempty"`
 	// Custom allocations
-	CustomInteger_1 uint64 `protobuf:"varint,1001,opt,name=custom_integer_1,json=customInteger1,proto3" json:"custom_integer_1,omitempty"`
-	CustomInteger_2 uint64 `protobuf:"varint,1002,opt,name=custom_integer_2,json=customInteger2,proto3" json:"custom_integer_2,omitempty"`
-	CustomInteger_3 uint64 `protobuf:"varint,1003,opt,name=custom_integer_3,json=customInteger3,proto3" json:"custom_integer_3,omitempty"`
-	CustomInteger_4 uint64 `protobuf:"varint,1004,opt,name=custom_integer_4,json=customInteger4,proto3" json:"custom_integer_4,omitempty"`
-	CustomInteger_5 uint64 `protobuf:"varint,1005,opt,name=custom_integer_5,json=customInteger5,proto3" json:"custom_integer_5,omitempty"`
-	CustomBytes_1   []byte `protobuf:"bytes,1011,opt,name=custom_bytes_1,json=customBytes1,proto3" json:"custom_bytes_1,omitempty"`
-	CustomBytes_2   []byte `protobuf:"bytes,1012,opt,name=custom_bytes_2,json=customBytes2,proto3" json:"custom_bytes_2,omitempty"`
-	CustomBytes_3   []byte `protobuf:"bytes,1013,opt,name=custom_bytes_3,json=customBytes3,proto3" json:"custom_bytes_3,omitempty"`
-	CustomBytes_4   []byte `protobuf:"bytes,1014,opt,name=custom_bytes_4,json=customBytes4,proto3" json:"custom_bytes_4,omitempty"`
-	CustomBytes_5   []byte `protobuf:"bytes,1015,opt,name=custom_bytes_5,json=customBytes5,proto3" json:"custom_bytes_5,omitempty"`
+	CustomInteger_1 uint64   `protobuf:"varint,1001,opt,name=custom_integer_1,json=customInteger1,proto3" json:"custom_integer_1,omitempty"`
+	CustomInteger_2 uint64   `protobuf:"varint,1002,opt,name=custom_integer_2,json=customInteger2,proto3" json:"custom_integer_2,omitempty"`
+	CustomInteger_3 uint64   `protobuf:"varint,1003,opt,name=custom_integer_3,json=customInteger3,proto3" json:"custom_integer_3,omitempty"`
+	CustomInteger_4 uint64   `protobuf:"varint,1004,opt,name=custom_integer_4,json=customInteger4,proto3" json:"custom_integer_4,omitempty"`
+	CustomInteger_5 uint64   `protobuf:"varint,1005,opt,name=custom_integer_5,json=customInteger5,proto3" json:"custom_integer_5,omitempty"`
+	CustomBytes_1   []byte   `protobuf:"bytes,1011,opt,name=custom_bytes_1,json=customBytes1,proto3" json:"custom_bytes_1,omitempty"`
+	CustomBytes_2   []byte   `protobuf:"bytes,1012,opt,name=custom_bytes_2,json=customBytes2,proto3" json:"custom_bytes_2,omitempty"`
+	CustomBytes_3   []byte   `protobuf:"bytes,1013,opt,name=custom_bytes_3,json=customBytes3,proto3" json:"custom_bytes_3,omitempty"`
+	CustomBytes_4   []byte   `protobuf:"bytes,1014,opt,name=custom_bytes_4,json=customBytes4,proto3" json:"custom_bytes_4,omitempty"`
+	CustomBytes_5   []byte   `protobuf:"bytes,1015,opt,name=custom_bytes_5,json=customBytes5,proto3" json:"custom_bytes_5,omitempty"`
+	CustomList_1    []uint32 `protobuf:"varint,1021,rep,packed,name=custom_list_1,json=customList1,proto3" json:"custom_list_1,omitempty"`
 }
 
 func (x *FlowMessage) Reset() {
@@ -685,11 +686,18 @@ func (x *FlowMessage) GetCustomBytes_5() []byte {
 	return nil
 }
 
+func (x *FlowMessage) GetCustomList_1() []uint32 {
+	if x != nil {
+		return x.CustomList_1
+	}
+	return nil
+}
+
 var File_pb_flow_proto protoreflect.FileDescriptor
 
 var file_pb_flow_proto_rawDesc = []byte{
 	0x0a, 0x0d, 0x70, 0x62, 0x2f, 0x66, 0x6c, 0x6f, 0x77, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12,
-	0x06, 0x66, 0x6c, 0x6f, 0x77, 0x70, 0x62, 0x22, 0xeb, 0x12, 0x0a, 0x0b, 0x46, 0x6c, 0x6f, 0x77,
+	0x06, 0x66, 0x6c, 0x6f, 0x77, 0x70, 0x62, 0x22, 0x90, 0x13, 0x0a, 0x0b, 0x46, 0x6c, 0x6f, 0x77,
 	0x4d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65, 0x12, 0x30, 0x0a, 0x04, 0x74, 0x79, 0x70, 0x65, 0x18,
 	0x01, 0x20, 0x01, 0x28, 0x0e, 0x32, 0x1c, 0x2e, 0x66, 0x6c, 0x6f, 0x77, 0x70, 0x62, 0x2e, 0x46,
 	0x6c, 0x6f, 0x77, 0x4d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65, 0x2e, 0x46, 0x6c, 0x6f, 0x77, 0x54,
@@ -835,15 +843,17 @@ var file_pb_flow_proto_rawDesc = []byte{
 	0x74, 0x6f, 0x6d, 0x42, 0x79, 0x74, 0x65, 0x73, 0x34, 0x12, 0x25, 0x0a, 0x0e, 0x63, 0x75, 0x73,
 	0x74, 0x6f, 0x6d, 0x5f, 0x62, 0x79, 0x74, 0x65, 0x73, 0x5f, 0x35, 0x18, 0xf7, 0x07, 0x20, 0x01,
 	0x28, 0x0c, 0x52, 0x0c, 0x63, 0x75, 0x73, 0x74, 0x6f, 0x6d, 0x42, 0x79, 0x74, 0x65, 0x73, 0x35,
-	0x22, 0x53, 0x0a, 0x08, 0x46, 0x6c, 0x6f, 0x77, 0x54, 0x79, 0x70, 0x65, 0x12, 0x0f, 0x0a, 0x0b,
-	0x46, 0x4c, 0x4f, 0x57, 0x55, 0x4e, 0x4b, 0x4e, 0x4f, 0x57, 0x4e, 0x10, 0x00, 0x12, 0x0b, 0x0a,
-	0x07, 0x53, 0x46, 0x4c, 0x4f, 0x57, 0x5f, 0x35, 0x10, 0x01, 0x12, 0x0e, 0x0a, 0x0a, 0x4e, 0x45,
-	0x54, 0x46, 0x4c, 0x4f, 0x57, 0x5f, 0x56, 0x35, 0x10, 0x02, 0x12, 0x0e, 0x0a, 0x0a, 0x4e, 0x45,
-	0x54, 0x46, 0x4c, 0x4f, 0x57, 0x5f, 0x56, 0x39, 0x10, 0x03, 0x12, 0x09, 0x0a, 0x05, 0x49, 0x50,
-	0x46, 0x49, 0x58, 0x10, 0x04, 0x42, 0x29, 0x5a, 0x27, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e,
-	0x63, 0x6f, 0x6d, 0x2f, 0x6e, 0x65, 0x74, 0x73, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x72, 0x2f, 0x67,
-	0x6f, 0x66, 0x6c, 0x6f, 0x77, 0x32, 0x2f, 0x70, 0x62, 0x3b, 0x66, 0x6c, 0x6f, 0x77, 0x70, 0x62,
-	0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+	0x12, 0x23, 0x0a, 0x0d, 0x63, 0x75, 0x73, 0x74, 0x6f, 0x6d, 0x5f, 0x6c, 0x69, 0x73, 0x74, 0x5f,
+	0x31, 0x18, 0xfd, 0x07, 0x20, 0x03, 0x28, 0x0d, 0x52, 0x0b, 0x63, 0x75, 0x73, 0x74, 0x6f, 0x6d,
+	0x4c, 0x69, 0x73, 0x74, 0x31, 0x22, 0x53, 0x0a, 0x08, 0x46, 0x6c, 0x6f, 0x77, 0x54, 0x79, 0x70,
+	0x65, 0x12, 0x0f, 0x0a, 0x0b, 0x46, 0x4c, 0x4f, 0x57, 0x55, 0x4e, 0x4b, 0x4e, 0x4f, 0x57, 0x4e,
+	0x10, 0x00, 0x12, 0x0b, 0x0a, 0x07, 0x53, 0x46, 0x4c, 0x4f, 0x57, 0x5f, 0x35, 0x10, 0x01, 0x12,
+	0x0e, 0x0a, 0x0a, 0x4e, 0x45, 0x54, 0x46, 0x4c, 0x4f, 0x57, 0x5f, 0x56, 0x35, 0x10, 0x02, 0x12,
+	0x0e, 0x0a, 0x0a, 0x4e, 0x45, 0x54, 0x46, 0x4c, 0x4f, 0x57, 0x5f, 0x56, 0x39, 0x10, 0x03, 0x12,
+	0x09, 0x0a, 0x05, 0x49, 0x50, 0x46, 0x49, 0x58, 0x10, 0x04, 0x42, 0x29, 0x5a, 0x27, 0x67, 0x69,
+	0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x6e, 0x65, 0x74, 0x73, 0x61, 0x6d, 0x70,
+	0x6c, 0x65, 0x72, 0x2f, 0x67, 0x6f, 0x66, 0x6c, 0x6f, 0x77, 0x32, 0x2f, 0x70, 0x62, 0x3b, 0x66,
+	0x6c, 0x6f, 0x77, 0x70, 0x62, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
diff --git a/pb/flow.proto b/pb/flow.proto
index 2220ddf..1cbaae8 100644
--- a/pb/flow.proto
+++ b/pb/flow.proto
@@ -126,4 +126,6 @@ message FlowMessage {
   bytes custom_bytes_4 = 1014;
   bytes custom_bytes_5 = 1015;
 
+  repeated uint32 custom_list_1 = 1021;
+
 }
diff --git a/producer/reflect.go b/producer/reflect.go
index 1b91b0b..086a3d0 100644
--- a/producer/reflect.go
+++ b/producer/reflect.go
@@ -41,6 +41,14 @@ func GetBytes(d []byte, offset int, length int) []byte {
 	return chunk
 }
 
+func IsUInt(k reflect.Kind) bool {
+	return k == reflect.Uint8 || k == reflect.Uint16 || k == reflect.Uint32 || k == reflect.Uint64
+}
+
+func IsInt(k reflect.Kind) bool {
+	return k == reflect.Int8 || k == reflect.Int16 || k == reflect.Int32 || k == reflect.Int64
+}
+
 func MapCustomNetFlow(flowMessage *flowmessage.FlowMessage, df netflow.DataField, mapper *NetFlowMapper) {
 	if mapper == nil {
 		return
@@ -62,11 +70,27 @@ func MapCustom(flowMessage *flowmessage.FlowMessage, v []byte, destination strin
 		typeDest := fieldValue.Type()
 		fieldValueAddr := fieldValue.Addr()
 
-		if typeDest.Kind() == reflect.Slice && typeDest.Elem().Kind() == reflect.Uint8 {
-			fieldValue.SetBytes(v)
-		} else if fieldValueAddr.IsValid() && (typeDest.Kind() == reflect.Uint8 || typeDest.Kind() == reflect.Uint16 || typeDest.Kind() == reflect.Uint32 || typeDest.Kind() == reflect.Uint64) {
+		if typeDest.Kind() == reflect.Slice {
+
+			if typeDest.Elem().Kind() == reflect.Uint8 {
+				fieldValue.SetBytes(v)
+			} else {
+				item := reflect.New(typeDest.Elem())
+
+				if IsUInt(typeDest.Elem().Kind()) {
+					DecodeUNumber(v, item.Interface())
+				} else if IsUInt(typeDest.Elem().Kind()) {
+					DecodeUNumber(v, item.Interface())
+				}
+
+				itemi := reflect.Indirect(item)
+				tmpFieldValue := reflect.Append(fieldValue, itemi)
+				fieldValue.Set(tmpFieldValue)
+			}
+
+		} else if fieldValueAddr.IsValid() && IsUInt(typeDest.Kind()) {
 			DecodeUNumber(v, fieldValueAddr.Interface())
-		} else if fieldValueAddr.IsValid() && (typeDest.Kind() == reflect.Int8 || typeDest.Kind() == reflect.Int16 || typeDest.Kind() == reflect.Int32 || typeDest.Kind() == reflect.Int64) {
+		} else if fieldValueAddr.IsValid() && IsInt(typeDest.Kind()) {
 			DecodeNumber(v, fieldValueAddr.Interface())
 		}
 	}
diff --git a/utils/utils.go b/utils/utils.go
index d4bbef2..2aab45a 100644
--- a/utils/utils.go
+++ b/utils/utils.go
@@ -71,20 +71,20 @@ type Formatter interface {
 type DefaultLogTransport struct {
 }
 
-func (s *DefaultLogTransport) Publish(msgs []*flowmessage.FlowMessage) {
-	for _, msg := range msgs {
-		fmt.Printf("%v\n", FlowMessageToString(msg))
+	func (s *DefaultLogTransport) Publish(msgs []*flowmessage.FlowMessage) {
+		for _, msg := range msgs {
+			fmt.Printf("%v\n", FlowMessageToString(msg))
+		}
 	}
-}
 
 type DefaultJSONTransport struct {
 }
 
-func (s *DefaultJSONTransport) Publish(msgs []*flowmessage.FlowMessage) {
-	for _, msg := range msgs {
-		fmt.Printf("%v\n", FlowMessageToJSON(msg))
+	func (s *DefaultJSONTransport) Publish(msgs []*flowmessage.FlowMessage) {
+		for _, msg := range msgs {
+			fmt.Printf("%v\n", FlowMessageToJSON(msg))
+		}
 	}
-}
 */
 type DefaultErrorCallback struct {
 	Logger Logger