diff --git a/controllers/networkHttpController.go b/controllers/networkHttpController.go
index c083d043..cc669b56 100644
--- a/controllers/networkHttpController.go
+++ b/controllers/networkHttpController.go
@@ -149,8 +149,11 @@ func validateNetworkCreate(network models.Network) error {
 		return isvalid
 	})
         _ = v.RegisterValidation("addressrange6_valid", func(fl validator.FieldLevel) bool {
-                isvalid := fl.Field().String() == "" || functions.IsIpCIDR(fl.Field().String())
-                return isvalid
+		isvalid := true
+		if *network.IsDualStack {
+			isvalid = functions.IsIpCIDR(fl.Field().String())
+		}
+		return isvalid
         })
 
 
diff --git a/models/network.go b/models/network.go
index 180f4704..05ca3200 100644
--- a/models/network.go
+++ b/models/network.go
@@ -11,7 +11,7 @@ import (
 type Network struct {
 	ID	primitive.ObjectID `json:"_id,omitempty" bson:"_id,omitempty"`
 	AddressRange	string `json:"addressrange" bson:"addressrange" validate:"required,addressrange_valid"`
-	AddressRange6	string `json:"addressrange6" bson:"addressrange6" validate:"required,addressrange6_valid"`
+	AddressRange6	string `json:"addressrange6" bson:"addressrange6" validate:"addressrange6_valid"`
 	DisplayName string `json:"displayname,omitempty" bson:"displayname,omitempty" validate:"omitempty,displayname_unique,min=1,max=100"`
 	NetID string `json:"netid" bson:"netid" validate:"required,netid_valid,min=1,max=12"`
 	NodesLastModified	int64 `json:"nodeslastmodified" bson:"nodeslastmodified"`