diff --git a/internal/definitions/interface.go b/internal/definitions/interface.go
index 97e1de9..11f4e44 100644
--- a/internal/definitions/interface.go
+++ b/internal/definitions/interface.go
@@ -8,7 +8,7 @@ type Interface struct {
 	Alias             string                  `json:"alias,omitempty" validate:"min=0,max=3"`
 	Type              InterfaceType           `json:"type" validate:"min=0,max=3"`
 	AddressingMode    InterfaceAddressingMode `json:"addressing_mode" validate:"min=0,max=2"`
-	Address           *IPNet                  `json:"address,omitempty" validate:"excluded_unless=AddressingMode 1"`
+	Address           *IPCIDR                 `json:"address,omitempty" validate:"excluded_unless=AddressingMode 1"`
 	HardwareInterface *string                 `json:"hardware_interface,omitempty"`
 	// TODO fix Validator for int pointers with min=0,max=4094
 	VlanID        *uint     `json:"vlan_id,omitempty"`
diff --git a/internal/definitions/ipcidr.go b/internal/definitions/ipcidr.go
new file mode 100644
index 0000000..480ef07
--- /dev/null
+++ b/internal/definitions/ipcidr.go
@@ -0,0 +1,32 @@
+package definitions
+
+import (
+	"encoding/json"
+	"net"
+)
+
+// IPCIDR is IP Address with the mask in CIDR format
+type IPCIDR struct {
+	net.IPNet
+}
+
+// MarshalJSON for IPCIDR
+func (i IPCIDR) MarshalJSON() ([]byte, error) {
+	return json.Marshal(i.String())
+}
+
+// UnmarshalJSON for IPCIDR
+func (i *IPCIDR) UnmarshalJSON(b []byte) error {
+	var s string
+	if err := json.Unmarshal(b, &s); err != nil {
+		return err
+	}
+
+	ip, ipnet, err := net.ParseCIDR(s)
+	if err != nil {
+		return err
+	}
+	i.IPNet = *ipnet
+	i.IPNet.IP = ip
+	return nil
+}