diff --git a/ipmgmt/.openapi-generator/FILES b/ipmgmt/.openapi-generator/FILES
index 6d55d66..7bff2f2 100644
--- a/ipmgmt/.openapi-generator/FILES
+++ b/ipmgmt/.openapi-generator/FILES
@@ -1,5 +1,4 @@
 .gitignore
-.openapi-generator-ignore
 .travis.yml
 README.md
 api/openapi.yaml
@@ -19,6 +18,7 @@ docs/NullRouteIPOpts.md
 docs/NullRoutedIP.md
 docs/ProtocolVersion.md
 docs/ReverseLookup.md
+docs/Sort.md
 docs/Subnet.md
 docs/UpdateIPOpts.md
 docs/UpdateNullRouteOpts.md
@@ -39,11 +39,11 @@ model_null_route_ip_opts.go
 model_null_routed_ip.go
 model_protocol_version.go
 model_reverse_lookup.go
+model_sort.go
 model_subnet.go
 model_update_ip_opts.go
 model_update_null_route_opts.go
 model_update_reverse_lookup_records_opts.go
 model_update_reverse_lookup_records_result.go
 response.go
-test/api_ipmgmt_test.go
 utils.go
diff --git a/ipmgmt/README.md b/ipmgmt/README.md
index 1200662..3706ea2 100644
--- a/ipmgmt/README.md
+++ b/ipmgmt/README.md
@@ -104,6 +104,7 @@ Class | Method | HTTP request | Description
  - [NullRoutedIP](docs/NullRoutedIP.md)
  - [ProtocolVersion](docs/ProtocolVersion.md)
  - [ReverseLookup](docs/ReverseLookup.md)
+ - [Sort](docs/Sort.md)
  - [Subnet](docs/Subnet.md)
  - [UpdateIPOpts](docs/UpdateIPOpts.md)
  - [UpdateNullRouteOpts](docs/UpdateNullRouteOpts.md)
diff --git a/ipmgmt/api/openapi.yaml b/ipmgmt/api/openapi.yaml
index b6c3ff0..6fab665 100644
--- a/ipmgmt/api/openapi.yaml
+++ b/ipmgmt/api/openapi.yaml
@@ -151,7 +151,7 @@ paths:
         name: sort
         required: false
         schema:
-          type: string
+          $ref: '#/components/schemas/sort'
         style: form
       - description: Filter by reverse lookup.
         example: mydomain1.example.com
@@ -887,7 +887,7 @@ paths:
         name: sort
         required: false
         schema:
-          type: string
+          $ref: '#/components/schemas/sort'
         style: form
       responses:
         "200":
@@ -1182,7 +1182,7 @@ components:
       name: sort
       required: false
       schema:
-        type: string
+        $ref: '#/components/schemas/sort'
       style: form
     reverseLookup:
       description: Filter by reverse lookup.
@@ -1287,6 +1287,12 @@ components:
       - ROUTER2
       - IPMI
       type: string
+    sort:
+      enum:
+      - ip
+      - nullRouted
+      - reverseLookup
+      type: string
     assignedContract:
       description: An explanation about the purpose of this instance.
       example:
diff --git a/ipmgmt/api_ipmgmt.go b/ipmgmt/api_ipmgmt.go
index 7197b90..ef6b46a 100644
--- a/ipmgmt/api_ipmgmt.go
+++ b/ipmgmt/api_ipmgmt.go
@@ -177,7 +177,7 @@ type ApiGetIPListRequest struct {
 	ips *string
 	equipmentIds *string
 	assignedContractIds *string
-	sort *string
+	sort *Sort
 	reverseLookup *string
 }
 
@@ -254,7 +254,7 @@ func (r ApiGetIPListRequest) AssignedContractIds(assignedContractIds string) Api
 }
 
 // Comma-separated list of sort field names. Prepend the field name with '-' for descending order. E.g. `sort=ip,-nullrouted`. Sortable field names are ip, nullRouted, reverseLookup.
-func (r ApiGetIPListRequest) Sort(sort string) ApiGetIPListRequest {
+func (r ApiGetIPListRequest) Sort(sort Sort) ApiGetIPListRequest {
 	r.sort = &sort
 	return r
 }
@@ -470,7 +470,7 @@ type ApiGetNullRouteHistoryListRequest struct {
 	ticketId *string
 	contractId *string
 	equipmentId *string
-	sort *string
+	sort *Sort
 }
 
 // Limit the number of results returned.
@@ -540,7 +540,7 @@ func (r ApiGetNullRouteHistoryListRequest) EquipmentId(equipmentId string) ApiGe
 }
 
 // Comma-separated list of sort field names. Prepend the field name with '-' for descending order. E.g. `sort=ip,-nullrouted`. Sortable field names are ip, nullRouted, reverseLookup.
-func (r ApiGetNullRouteHistoryListRequest) Sort(sort string) ApiGetNullRouteHistoryListRequest {
+func (r ApiGetNullRouteHistoryListRequest) Sort(sort Sort) ApiGetNullRouteHistoryListRequest {
 	r.sort = &sort
 	return r
 }
diff --git a/ipmgmt/docs/IpmgmtAPI.md b/ipmgmt/docs/IpmgmtAPI.md
index f42256d..7a8f2f6 100644
--- a/ipmgmt/docs/IpmgmtAPI.md
+++ b/ipmgmt/docs/IpmgmtAPI.md
@@ -48,7 +48,7 @@ func main() {
 	ips := "ips_example" // string | Return only IPs specified as a comma-separated list (optional)
 	equipmentIds := "equipmentIds_example" // string | Return only IPs assigned to equipment items specified as a comma-separated list of IDs (optional)
 	assignedContractIds := "assignedContractIds_example" // string | Return only IPs assigned to contracts specified as a comma-separated list of IDs (optional)
-	sort := "sort_example" // string | Comma-separated list of sort field names. Prepend the field name with '-' for descending order. E.g. `sort=ip,-nullrouted`. Sortable field names are ip, nullRouted, reverseLookup. (optional)
+	sort := openapiclient.sort("ip") // Sort | Comma-separated list of sort field names. Prepend the field name with '-' for descending order. E.g. `sort=ip,-nullrouted`. Sortable field names are ip, nullRouted, reverseLookup. (optional)
 	reverseLookup := "mydomain1.example.com" // string | Filter by reverse lookup. (optional)
 
 	configuration := openapiclient.NewConfiguration()
@@ -86,7 +86,7 @@ Name | Type | Description  | Notes
  **ips** | **string** | Return only IPs specified as a comma-separated list | 
  **equipmentIds** | **string** | Return only IPs assigned to equipment items specified as a comma-separated list of IDs | 
  **assignedContractIds** | **string** | Return only IPs assigned to contracts specified as a comma-separated list of IDs | 
- **sort** | **string** | Comma-separated list of sort field names. Prepend the field name with '-' for descending order. E.g. `sort=ip,-nullrouted`. Sortable field names are ip, nullRouted, reverseLookup. | 
+ **sort** | [**Sort**](Sort.md) | Comma-separated list of sort field names. Prepend the field name with '-' for descending order. E.g. `sort=ip,-nullrouted`. Sortable field names are ip, nullRouted, reverseLookup. | 
  **reverseLookup** | **string** | Filter by reverse lookup. | 
 
 ### Return type
@@ -138,7 +138,7 @@ func main() {
 	ticketId := "ticketId_example" // string | Filter by the reference stored with the null route (optional)
 	contractId := "contractId_example" // string | Filter by ID of the contract assigned to the IP at the time of null route creation (optional)
 	equipmentId := "equipmentId_example" // string | Filter by ID of the server assigned to the IP at the time of null route creation (optional)
-	sort := "sort_example" // string | Comma-separated list of sort field names. Prepend the field name with '-' for descending order. E.g. `sort=ip,-nullrouted`. Sortable field names are ip, nullRouted, reverseLookup. (optional)
+	sort := openapiclient.sort("ip") // Sort | Comma-separated list of sort field names. Prepend the field name with '-' for descending order. E.g. `sort=ip,-nullrouted`. Sortable field names are ip, nullRouted, reverseLookup. (optional)
 
 	configuration := openapiclient.NewConfiguration()
 	apiClient := openapiclient.NewAPIClient(configuration)
@@ -174,7 +174,7 @@ Name | Type | Description  | Notes
  **ticketId** | **string** | Filter by the reference stored with the null route | 
  **contractId** | **string** | Filter by ID of the contract assigned to the IP at the time of null route creation | 
  **equipmentId** | **string** | Filter by ID of the server assigned to the IP at the time of null route creation | 
- **sort** | **string** | Comma-separated list of sort field names. Prepend the field name with '-' for descending order. E.g. `sort=ip,-nullrouted`. Sortable field names are ip, nullRouted, reverseLookup. | 
+ **sort** | [**Sort**](Sort.md) | Comma-separated list of sort field names. Prepend the field name with '-' for descending order. E.g. `sort=ip,-nullrouted`. Sortable field names are ip, nullRouted, reverseLookup. | 
 
 ### Return type
 
diff --git a/ipmgmt/docs/Sort.md b/ipmgmt/docs/Sort.md
new file mode 100644
index 0000000..e0b3a04
--- /dev/null
+++ b/ipmgmt/docs/Sort.md
@@ -0,0 +1,15 @@
+# Sort
+
+## Enum
+
+
+* `IP` (value: `"ip"`)
+
+* `NULL_ROUTED` (value: `"nullRouted"`)
+
+* `REVERSE_LOOKUP` (value: `"reverseLookup"`)
+
+
+[[Back to Model list]](../README.md#documentation-for-models) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to README]](../README.md)
+
+
diff --git a/ipmgmt/model_sort.go b/ipmgmt/model_sort.go
new file mode 100644
index 0000000..b97a1b7
--- /dev/null
+++ b/ipmgmt/model_sort.go
@@ -0,0 +1,113 @@
+/*
+LeaseWeb API for IP address management
+
+> The base URL for this API is: **https://api.leaseweb.com/ipMgmt/v2/_**
+
+API version: v2
+*/
+
+// Code generated by OpenAPI Generator (https://openapi-generator.tech); DO NOT EDIT.
+
+package ipmgmt
+
+import (
+	"encoding/json"
+	"fmt"
+)
+
+// Sort the model 'Sort'
+type Sort string
+
+// List of sort
+const (
+	SORT_IP Sort = "ip"
+	SORT_NULL_ROUTED Sort = "nullRouted"
+	SORT_REVERSE_LOOKUP Sort = "reverseLookup"
+)
+
+// All allowed values of Sort enum
+var AllowedSortEnumValues = []Sort{
+	"ip",
+	"nullRouted",
+	"reverseLookup",
+}
+
+func (v *Sort) UnmarshalJSON(src []byte) error {
+	var value string
+	err := json.Unmarshal(src, &value)
+	if err != nil {
+		return err
+	}
+	enumTypeValue := Sort(value)
+	for _, existing := range AllowedSortEnumValues {
+		if existing == enumTypeValue {
+			*v = enumTypeValue
+			return nil
+		}
+	}
+
+	return fmt.Errorf("%+v is not a valid Sort", value)
+}
+
+// NewSortFromValue returns a pointer to a valid Sort
+// for the value passed as argument, or an error if the value passed is not allowed by the enum
+func NewSortFromValue(v string) (*Sort, error) {
+	ev := Sort(v)
+	if ev.IsValid() {
+		return &ev, nil
+	} else {
+		return nil, fmt.Errorf("invalid value '%v' for Sort: valid values are %v", v, AllowedSortEnumValues)
+	}
+}
+
+// IsValid return true if the value is valid for the enum, false otherwise
+func (v Sort) IsValid() bool {
+	for _, existing := range AllowedSortEnumValues {
+		if existing == v {
+			return true
+		}
+	}
+	return false
+}
+
+// Ptr returns reference to sort value
+func (v Sort) Ptr() *Sort {
+	return &v
+}
+
+type NullableSort struct {
+	value *Sort
+	isSet bool
+}
+
+func (v NullableSort) Get() *Sort {
+	return v.value
+}
+
+func (v *NullableSort) Set(val *Sort) {
+	v.value = val
+	v.isSet = true
+}
+
+func (v NullableSort) IsSet() bool {
+	return v.isSet
+}
+
+func (v *NullableSort) Unset() {
+	v.value = nil
+	v.isSet = false
+}
+
+func NewNullableSort(val *Sort) *NullableSort {
+	return &NullableSort{value: val, isSet: true}
+}
+
+func (v NullableSort) MarshalJSON() ([]byte, error) {
+	return json.Marshal(v.value)
+}
+
+func (v *NullableSort) UnmarshalJSON(src []byte) error {
+	v.isSet = true
+	return json.Unmarshal(src, &v.value)
+}
+