diff --git a/netbox/ipam/api/serializers.py b/netbox/ipam/api/serializers.py
index aa1d2834a..d4ab43100 100644
--- a/netbox/ipam/api/serializers.py
+++ b/netbox/ipam/api/serializers.py
@@ -352,15 +352,17 @@ class AvailableIPSerializer(serializers.Serializer):
     family = serializers.IntegerField(read_only=True)
     address = serializers.CharField(read_only=True)
     vrf = NestedVRFSerializer(read_only=True)
+    mask_length = serializers.IntegerField(read_only=True, allow_null=True)
 
     def to_representation(self, instance):
         if self.context.get('vrf'):
             vrf = NestedVRFSerializer(self.context['vrf'], context={'request': self.context['request']}).data
         else:
             vrf = None
+        mask_length = self.context.get('mask_length') or self.context['parent'].mask_length
         return OrderedDict([
             ('family', self.context['parent'].family),
-            ('address', f"{instance}/{self.context['parent'].mask_length}"),
+            ('address', f"{instance}/{mask_length}"),
             ('vrf', vrf),
         ])
 
diff --git a/netbox/ipam/api/views.py b/netbox/ipam/api/views.py
index 0d098db4b..7fe0f5e7d 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)