diff --git a/server/src/main/java/org/apache/cloudstack/network/RoutedIpv4ManagerImpl.java b/server/src/main/java/org/apache/cloudstack/network/RoutedIpv4ManagerImpl.java
index 50ec8a827b4..5174a5d7688 100644
--- a/server/src/main/java/org/apache/cloudstack/network/RoutedIpv4ManagerImpl.java
+++ b/server/src/main/java/org/apache/cloudstack/network/RoutedIpv4ManagerImpl.java
@@ -607,10 +607,20 @@ public class RoutedIpv4ManagerImpl extends ComponentLifecycleBase implements Rou
     }
 
     protected Ipv4GuestSubnetNetworkMap getOrCreateIpv4SubnetForGuestNetworkOrVpcInternal(Integer cidrSize, Long ownerDomainId, Long ownerAccountId, Long zoneId) {
-        validateNetworkCidrSize(ownerAccountId, cidrSize);
+        validateNetworkCidrSize(cidrSize);
         List<DataCenterIpv4GuestSubnetVO> subnets = getZoneSubnetsForAccount(ownerDomainId, ownerAccountId, zoneId);
         for (DataCenterIpv4GuestSubnetVO subnet : subnets) {
-            Ipv4GuestSubnetNetworkMap result = getOrCreateIpv4SubnetForGuestNetworkOrVpcInternal(cidrSize, subnet);
+            Ipv4GuestSubnetNetworkMap result = getIpv4SubnetForGuestNetworkOrVpcInternal(cidrSize, subnet);
+            if (result != null) {
+                return result;
+            }
+        }
+        Boolean isAutoAllocationEnabled = RoutedIPv4NetworkCidrAutoAllocationEnabled.valueIn(ownerAccountId);
+        if (!Boolean.TRUE.equals(isAutoAllocationEnabled)) {
+            throw new InvalidParameterValueException("CIDR auto-allocation is disabled for this account");
+        }
+        for (DataCenterIpv4GuestSubnetVO subnet : subnets) {
+            Ipv4GuestSubnetNetworkMap result = createIpv4SubnetForGuestNetworkOrVpcInternal(cidrSize, subnet);
             if (result != null) {
                 return result;
             }
@@ -618,11 +628,11 @@ public class RoutedIpv4ManagerImpl extends ComponentLifecycleBase implements Rou
         return null;
     }
 
-    protected Ipv4GuestSubnetNetworkMap getOrCreateIpv4SubnetForGuestNetworkOrVpcInternal(Integer cidrSize, DataCenterIpv4GuestSubnetVO subnet) {
-        Ipv4GuestSubnetNetworkMap map = ipv4GuestSubnetNetworkMapDao.findFirstAvailable(subnet.getId(), cidrSize);
-        if (map != null) {
-            return map;
-        }
+    protected Ipv4GuestSubnetNetworkMap getIpv4SubnetForGuestNetworkOrVpcInternal(Integer cidrSize, DataCenterIpv4GuestSubnetVO subnet) {
+        return ipv4GuestSubnetNetworkMapDao.findFirstAvailable(subnet.getId(), cidrSize);
+    }
+
+    protected Ipv4GuestSubnetNetworkMap createIpv4SubnetForGuestNetworkOrVpcInternal(Integer cidrSize, DataCenterIpv4GuestSubnetVO subnet) {
         try {
             return createIpv4SubnetFromParentSubnet(subnet, cidrSize);
         } catch (Exception ex) {
@@ -631,6 +641,14 @@ public class RoutedIpv4ManagerImpl extends ComponentLifecycleBase implements Rou
         return null;
     }
 
+    protected Ipv4GuestSubnetNetworkMap getOrCreateIpv4SubnetForGuestNetworkOrVpcInternal(Integer cidrSize, DataCenterIpv4GuestSubnetVO subnet) {
+        Ipv4GuestSubnetNetworkMap map = getIpv4SubnetForGuestNetworkOrVpcInternal(cidrSize, subnet);
+        if (map != null) {
+            return map;
+        }
+        return createIpv4SubnetForGuestNetworkOrVpcInternal(cidrSize, subnet);
+    }
+
     protected void getOrCreateIpv4SubnetForGuestNetworkOrVpcInternal(String networkCidr, Long ownerDomainId, Long ownerAccountId, Long zoneId) {
         Ipv4GuestSubnetNetworkMapVO subnetMap = ipv4GuestSubnetNetworkMapDao.findBySubnet(networkCidr);
         if (subnetMap != null) {
@@ -693,13 +711,9 @@ public class RoutedIpv4ManagerImpl extends ComponentLifecycleBase implements Rou
         }
     }
 
-    private void validateNetworkCidrSize(long accountId, Integer networkCidrSize) {
+    private void validateNetworkCidrSize(Integer networkCidrSize) {
         if (networkCidrSize == null) {
-            throw new CloudRuntimeException("network/vpc CidrSize is null");
-        }
-        Boolean isAutoAllocationEnabled = RoutedIPv4NetworkCidrAutoAllocationEnabled.valueIn(accountId);
-        if (!Boolean.TRUE.equals(isAutoAllocationEnabled)) {
-            throw new CloudRuntimeException("CIDR auto-allocation is disabled for this account");
+            throw new InvalidParameterValueException("network/vpc CidrSize is null");
         }
     }
 
@@ -755,7 +769,7 @@ public class RoutedIpv4ManagerImpl extends ComponentLifecycleBase implements Rou
         // Allocate a subnet automatically
         String networkCidr = getFreeNetworkCidr(subnetsInFreeIpRanges, networkCidrSize);
         if (networkCidr == null) {
-            throw new CloudRuntimeException("Failed to automatically allocate a subnet with specified cidrsize");
+            throw new InvalidParameterValueException("Failed to automatically allocate a subnet with specified cidrsize");
         }
         return networkCidr;
     }
diff --git a/server/src/test/java/org/apache/cloudstack/network/RoutedIpv4ManagerImplTest.java b/server/src/test/java/org/apache/cloudstack/network/RoutedIpv4ManagerImplTest.java
index 5351abe2e2d..81110dd3f53 100644
--- a/server/src/test/java/org/apache/cloudstack/network/RoutedIpv4ManagerImplTest.java
+++ b/server/src/test/java/org/apache/cloudstack/network/RoutedIpv4ManagerImplTest.java
@@ -545,12 +545,12 @@ public class RoutedIpv4ManagerImplTest {
         DataCenterIpv4GuestSubnetVO subnet3 = Mockito.mock(DataCenterIpv4GuestSubnetVO.class);
         when(dataCenterIpv4GuestSubnetDao.listNonDedicatedByDataCenterId(zoneId)).thenReturn(Arrays.asList(subnet3));
 
-        doReturn(null).doReturn(null).doReturn(ipv4GuestSubnetNetworkMap).when(routedIpv4Manager).getOrCreateIpv4SubnetForGuestNetworkOrVpcInternal(eq(cidrSize), any());
+        doReturn(null).doReturn(null).doReturn(ipv4GuestSubnetNetworkMap).when(routedIpv4Manager).getIpv4SubnetForGuestNetworkOrVpcInternal(eq(cidrSize), any());
 
         Ipv4GuestSubnetNetworkMap result = routedIpv4Manager.getOrCreateIpv4SubnetForGuestNetworkOrVpcInternal(cidrSize, domainId, accountId, zoneId);
 
         Assert.assertEquals(ipv4GuestSubnetNetworkMap, result);
-        verify(routedIpv4Manager, times(3)).getOrCreateIpv4SubnetForGuestNetworkOrVpcInternal(eq(cidrSize), any());
+        verify(routedIpv4Manager, times(3)).getIpv4SubnetForGuestNetworkOrVpcInternal(eq(cidrSize), any());
     }
 
     @Test