diff --git a/adapters/secondary/controller_REST/controller.go b/adapters/secondary/controller_REST/controller.go
index 4c848da..cfa9238 100644
--- a/adapters/secondary/controller_REST/controller.go
+++ b/adapters/secondary/controller_REST/controller.go
@@ -21,7 +21,8 @@ import (
 	"regexp"
 	"strings"
 
-	"github.com/Juniper/contrail-go-api"
+	contrail "github.com/Juniper/contrail-go-api"
+	"github.com/Juniper/contrail-go-api/config"
 	"github.com/Juniper/contrail-go-api/types"
 	"github.com/Juniper/contrail-windows-docker-driver/common"
 	log "github.com/sirupsen/logrus"
@@ -49,8 +50,36 @@ func (c *ControllerAdapter) NewProject(domain, tenant string) (*types.Project, e
 }
 
 func (c *ControllerAdapter) CreateNetworkWithSubnet(tenantName, networkName, subnetCIDR string) (*types.VirtualNetwork, error) {
-	// TODO: possibly implement when fixing driver tests
-	return nil, errors.New("Not implemented - possibly TODO when fixing driver module tests.")
+	net, err := c.GetNetwork(tenantName, networkName)
+	if err == nil {
+		showDetails := true
+		details, err := config.NetworkShow(c.ApiClient, net.GetUuid(), showDetails)
+		if err != nil {
+			return nil, err
+		}
+		for _, existingCIDR := range details.Subnets {
+			if subnetCIDR == existingCIDR {
+				return net, nil
+			}
+		}
+		return nil, errors.New("such network already has a different subnet")
+	}
+	projectFQName := fmt.Sprintf("%s:%s", common.DomainName, tenantName)
+	project, err := c.ApiClient.FindByName("project", projectFQName)
+	if err != nil {
+		return nil, err
+	}
+
+	netUUID, err := config.CreateNetworkWithSubnet(c.ApiClient, project.GetUuid(), networkName, subnetCIDR)
+	if err != nil {
+		return nil, err
+	}
+
+	net, err = types.VirtualNetworkByUuid(c.ApiClient, netUUID)
+	if err != nil {
+		return nil, err
+	}
+	return net, nil
 }
 
 func (c *ControllerAdapter) GetNetwork(tenantName, networkName string) (*types.VirtualNetwork,
diff --git a/adapters/secondary/controller_REST/controller_test.go b/adapters/secondary/controller_REST/controller_test.go
index 8286046..fc7c0ea 100644
--- a/adapters/secondary/controller_REST/controller_test.go
+++ b/adapters/secondary/controller_REST/controller_test.go
@@ -159,6 +159,44 @@ var _ = Describe("ControllerAdapter", func() {
 		})
 	})
 
+	Describe("creating Contrail network with subnet", func() {
+		It("when network with the same subnet already exists in Contrail, returns it", func() {
+			testNetwork := CreateTestNetworkWithSubnet(client.ApiClient, networkName, subnetCIDR, project)
+
+			net, err := client.CreateNetworkWithSubnet(tenantName, networkName, subnetCIDR)
+
+			Expect(err).ToNot(HaveOccurred())
+			Expect(net).ToNot(BeNil())
+			Expect(net.GetNetworkIpamRefs()).To(HaveLen(1))
+			Expect(net.GetUuid()).To(Equal(testNetwork.GetUuid()))
+		})
+		It("when network doesn't exist in Contrail, it creates and returns it", func() {
+			net, err := client.CreateNetworkWithSubnet(tenantName, networkName, subnetCIDR)
+
+			Expect(err).ToNot(HaveOccurred())
+			Expect(net).ToNot(BeNil())
+			Expect(net.GetNetworkIpamRefs()).To(HaveLen(1))
+		})
+		It("when network with a different subnet already exists in Contrail, returns error", func() {
+			otherCIDR := "5.6.7.8/24"
+			Expect(subnetCIDR).ToNot(Equal(otherCIDR)) // sanity check
+			CreateTestNetworkWithSubnet(client.ApiClient, networkName, otherCIDR, project)
+
+			net, err := client.CreateNetworkWithSubnet(tenantName, networkName, subnetCIDR)
+
+			Expect(err).To(HaveOccurred())
+			Expect(net).To(BeNil())
+		})
+		It("when network without a subnet already exists in Contrail, returns error", func() {
+			CreateTestNetwork(client.ApiClient, networkName, project)
+
+			net, err := client.CreateNetworkWithSubnet(tenantName, networkName, subnetCIDR)
+
+			Expect(err).To(HaveOccurred())
+			Expect(net).To(BeNil())
+		})
+	})
+
 	Describe("getting Contrail subnet info", func() {
 		assertGettingSubnetFails := func(getTestedNet func() *types.VirtualNetwork,
 			CIDR string) func() {