diff --git a/README.md b/README.md
index 7e1ec0f722..67e420bffd 100644
--- a/README.md
+++ b/README.md
@@ -1185,6 +1185,8 @@ $ scw inspect myserver | jq '.[0].public_ip.address'
 ### master (unreleased)
 
 * `scw login` Add motd when you are already logged ([#371](https://github.com/scaleway/scaleway-cli/issues/371))
+* `scw _ips` add --detach flag
+* API add DetachIP method ([@nicolai86](https://github.com/scaleway/scaleway-cli/pull/378))
 * Fix error message with `--commercial-type=c2m` ([#374](https://github.com/scaleway/scaleway-cli/issues/374))
 * Add Logger Interface to avoid multiples dependencies in the API, thank you [@nicolai86](https://github.com/nicolai86) ([#369](https://github.com/scaleway/scaleway-cli/pull/369))
 * `scw run` handle `--ipv6` flag
diff --git a/pkg/api/api.go b/pkg/api/api.go
index d7147204bf..f9adf9c2f6 100644
--- a/pkg/api/api.go
+++ b/pkg/api/api.go
@@ -419,13 +419,13 @@ type ScalewayGetSecurityGroup struct {
 
 // ScalewayIPDefinition represents the IP's fields
 type ScalewayIPDefinition struct {
-	Organization string `json:"organization"`
-	Reverse      string `json:"reverse"`
-	ID           string `json:"id"`
-	Server       struct {
+	Organization string  `json:"organization"`
+	Reverse      *string `json:"reverse"`
+	ID           string  `json:"id"`
+	Server       *struct {
 		Identifier string `json:"id,omitempty"`
 		Name       string `json:"name,omitempty"`
-	} `json:"server,omitempty"`
+	} `json:"server"`
 	Address string `json:"address"`
 }
 
@@ -2315,29 +2315,18 @@ func (s *ScalewayAPI) AttachIP(ipID, serverID string) error {
 
 // DetachIP detaches an IP from a server
 func (s *ScalewayAPI) DetachIP(ipID string) error {
-	var update struct {
-		Address      string `json:"address"`
-		ID           string `json:"id"`
-		Organization string `json:"organization"`
-	}
-
 	ip, err := s.GetIP(ipID)
 	if err != nil {
 		return err
 	}
-
-	if ip.IP.Server.Identifier == "" {
-		return nil
+	ip.IP.Server = nil
+	resp, err := s.PutResponse(ComputeAPI, fmt.Sprintf("ips/%s", ipID), ip.IP)
+	if resp != nil {
+		defer resp.Body.Close()
 	}
-
-	update.Address = ip.IP.Address
-	update.ID = ip.IP.ID
-	update.Organization = ip.IP.Organization
-	resp, err := s.PutResponse(ComputeAPI, fmt.Sprintf("ips/%s", ipID), update)
 	if err != nil {
 		return err
 	}
-	defer resp.Body.Close()
 	_, err = s.handleHTTPError([]int{200}, resp)
 	return err
 }
@@ -2351,11 +2340,8 @@ func (s *ScalewayAPI) DeleteIP(ipID string) error {
 	if err != nil {
 		return err
 	}
-
-	if _, err := s.handleHTTPError([]int{204}, resp); err != nil {
-		return err
-	}
-	return nil
+	_, err = s.handleHTTPError([]int{204}, resp)
+	return err
 }
 
 // GetIP returns a ScalewayGetIP
diff --git a/pkg/cli/x_ips.go b/pkg/cli/x_ips.go
index 5e8bbbc4e3..1a3cfaf9e1 100644
--- a/pkg/cli/x_ips.go
+++ b/pkg/cli/x_ips.go
@@ -6,7 +6,7 @@ package cli
 
 var cmdIPS = &Command{
 	Exec:      runIPS,
-	UsageLine: "_ips [--new|--attach|--delete] [IP_ID [SERVER_ID]]",
+	UsageLine: "_ips [OPTIONS] [IP_ID [SERVER_ID]]",
 
 	Description: "Interacts with your IPs",
 	Hidden:      true,
@@ -17,6 +17,7 @@ var cmdIPS = &Command{
     $ scw _ips --new
     $ scw _ips --attach IP_ID SERVER_ID
     $ scw _ips --delete IP_ID
+    $ scw _ips --detach IP_ID
 `,
 }
 
@@ -24,12 +25,14 @@ func init() {
 	cmdIPS.Flag.BoolVar(&ipHelp, []string{"h", "-help"}, false, "Print usage")
 	cmdIPS.Flag.BoolVar(&ipNew, []string{"n", "-new"}, false, "Add a new IP")
 	cmdIPS.Flag.BoolVar(&ipAttach, []string{"a", "-attach"}, false, "Attach an IP to a server")
+	cmdIPS.Flag.BoolVar(&ipDetach, []string{"-detach"}, false, "Detach an IP from a server")
 	cmdIPS.Flag.StringVar(&ipDelete, []string{"d", "-delete"}, "", "Detele an IP")
 }
 
 var ipHelp bool     // -h, --help flag
 var ipNew bool      // -n, --new flag
 var ipAttach bool   // -a, --attach flag
+var ipDetach bool   // --detach flag
 var ipDelete string // -d, --delete flag
 
 func runIPS(cmd *Command, args []string) error {
@@ -53,6 +56,9 @@ func runIPS(cmd *Command, args []string) error {
 		}
 		return cmd.API.AttachIP(args[0], args[1])
 	}
+	if ipDetach {
+		return cmd.API.DetachIP(args[0])
+	}
 	if len(args) == 1 {
 		ip, err := cmd.API.GetIP(args[0])
 		if err != nil {