diff --git a/netbox/ipam/api/serializers.py b/netbox/ipam/api/serializers.py
index e571ba777..f8eb1c509 100644
--- a/netbox/ipam/api/serializers.py
+++ b/netbox/ipam/api/serializers.py
@@ -369,13 +369,14 @@ class RequestAvailableIPSerializer(IPAddressSerializer):
     """
     Representation of a request for new available IP
     """
+    mask_length = serializers.IntegerField(required=False)
 
     class Meta:
         model = IPAddress
         fields = [
             'tenant', 'status', 'role', 'assigned_object_type',
             'assigned_object', 'nat_inside', 'dns_name', 'description', 'tags',
-            'custom_fields'
+            'custom_fields', 'mask_length'
         ]
 
 
diff --git a/netbox/ipam/api/views.py b/netbox/ipam/api/views.py
index 15f35a082..73ae3d7af 100644
--- a/netbox/ipam/api/views.py
+++ b/netbox/ipam/api/views.py
@@ -294,7 +294,8 @@ class AvailableIPAddressesView(ObjectValidationMixin, APIView):
         # Assign addresses from the list of available IPs and copy VRF assignment from the parent
         available_ips = iter(available_ips)
         for requested_ip in requested_ips:
-            requested_ip['address'] = f'{next(available_ips)}/{parent.mask_length}'
+            mask_length = requested_ip.get('mask_length') or parent.mask_length
+            requested_ip['address'] = f'{next(available_ips)}/{mask_length}'
             requested_ip['vrf'] = parent.vrf.pk if parent.vrf else None
 
         # Initialize the serializer with a list or a single object depending on what was requested
diff --git a/netbox/ipam/tests/test_api.py b/netbox/ipam/tests/test_api.py
index 478c7f29b..be6818998 100644
--- a/netbox/ipam/tests/test_api.py
+++ b/netbox/ipam/tests/test_api.py
@@ -379,8 +379,8 @@ class PrefixTest(APIViewTestCases.APIViewTestCase):
         url = reverse('ipam-api:prefix-available-ips', kwargs={'pk': prefix.pk})
         self.add_permissions('ipam.view_prefix', 'ipam.add_ipaddress')
 
-        # Create all four available IPs with individual requests
-        for i in range(1, 5):
+        # Create three available IPs with individual requests
+        for i in range(1, 4):
             data = {
                 'description': 'Test IP {}'.format(i)
             }
@@ -388,6 +388,18 @@ class PrefixTest(APIViewTestCases.APIViewTestCase):
             self.assertHttpStatus(response, status.HTTP_201_CREATED)
             self.assertEqual(response.data['vrf']['id'], vrf.pk)
             self.assertEqual(response.data['description'], data['description'])
+            self.assertEqual(IPNetwork(response.data['address']).prefixlen, 30)
+
+        # Create one more IP with a specified mask length
+        data = {
+            'description': 'Test IP 4',
+            'mask_length': 32
+        }
+        response = self.client.post(url, data, format='json', **self.header)
+        self.assertHttpStatus(response, status.HTTP_201_CREATED)
+        self.assertEqual(response.data['vrf']['id'], vrf.pk)
+        self.assertEqual(response.data['description'], data['description'])
+        self.assertEqual(IPNetwork(response.data['address']).prefixlen, 32)
 
         # Try to create one more IP
         response = self.client.post(url, {}, **self.header)