diff --git a/neutron/common/constants.py b/neutron/common/constants.py
index 20a20470ad0..9c346f6c115 100644
--- a/neutron/common/constants.py
+++ b/neutron/common/constants.py
@@ -131,9 +131,6 @@ VALID_ETHERTYPES = (lib_constants.IPv4, lib_constants.IPv6)
 
 IP_ALLOWED_VERSIONS = [lib_constants.IP_VERSION_4, lib_constants.IP_VERSION_6]
 
-IPV4_MAX_PREFIXLEN = 32
-IPV6_MAX_PREFIXLEN = 128
-
 # Some components communicate using private address ranges, define
 # them all here. These address ranges should not cause any issues
 # even if they overlap since they are used in disjoint namespaces,
diff --git a/neutron/objects/common_types.py b/neutron/objects/common_types.py
index 4e79223446e..804ddc2f7fc 100644
--- a/neutron/objects/common_types.py
+++ b/neutron/objects/common_types.py
@@ -54,7 +54,7 @@ class IPNetworkPrefixLen(RangeConstrainedInteger):
     """IP network (CIDR) prefix length custom Enum"""
     def __init__(self, **kwargs):
         super(IPNetworkPrefixLen, self).__init__(
-              start=0, end=constants.IPV6_MAX_PREFIXLEN,
+              start=0, end=n_const.IPv6_BITS,
               **kwargs)
 
 
diff --git a/neutron/services/externaldns/drivers/designate/driver.py b/neutron/services/externaldns/drivers/designate/driver.py
index f9248cb406c..89d11cdd84f 100644
--- a/neutron/services/externaldns/drivers/designate/driver.py
+++ b/neutron/services/externaldns/drivers/designate/driver.py
@@ -20,6 +20,7 @@ from designateclient.v2 import client as d_client
 from keystoneclient.auth.identity.generic import password
 from keystoneclient.auth import token_endpoint
 from keystoneclient import session
+from neutron_lib import constants
 from oslo_config import cfg
 from oslo_log import log
 
@@ -175,8 +176,10 @@ class Designate(driver.ExternalDNSService):
 
     def _get_bytes_or_nybles_to_skip(self, in_addr_name):
         if 'in-addr.arpa' in in_addr_name:
-            return int((32 - CONF.designate.ipv4_ptr_zone_prefix_size) / 8)
-        return int((128 - CONF.designate.ipv6_ptr_zone_prefix_size) / 4)
+            return int((constants.IPv4_BITS -
+                        CONF.designate.ipv4_ptr_zone_prefix_size) / 8)
+        return int((constants.IPv6_BITS -
+                    CONF.designate.ipv6_ptr_zone_prefix_size) / 4)
 
     def delete_record_set(self, context, dns_domain, dns_name, records):
         designate, designate_admin = get_clients(context)
diff --git a/neutron/tests/tempest/api/test_network_ip_availability.py b/neutron/tests/tempest/api/test_network_ip_availability.py
index f84e14e9963..74395ea69fe 100644
--- a/neutron/tests/tempest/api/test_network_ip_availability.py
+++ b/neutron/tests/tempest/api/test_network_ip_availability.py
@@ -99,9 +99,11 @@ class NetworksIpAvailabilityTest(base.BaseAdminNetworkTest):
 def calc_total_ips(prefix, ip_version):
     # will calculate total ips after removing reserved.
     if ip_version == lib_constants.IP_VERSION_4:
-        total_ips = 2 ** (32 - prefix) - DEFAULT_IP4_RESERVED
+        total_ips = 2 ** (lib_constants.IPv4_BITS
+                          - prefix) - DEFAULT_IP4_RESERVED
     elif ip_version == lib_constants.IP_VERSION_6:
-        total_ips = 2 ** (128 - prefix) - DEFAULT_IP6_RESERVED
+        total_ips = 2 ** (lib_constants.IPv6_BITS
+                          - prefix) - DEFAULT_IP6_RESERVED
     return total_ips
 
 
diff --git a/neutron/tests/tools.py b/neutron/tests/tools.py
index 15760a40579..3d2a4c56c02 100644
--- a/neutron/tests/tools.py
+++ b/neutron/tests/tools.py
@@ -25,12 +25,13 @@ import warnings
 import fixtures
 import mock
 import netaddr
+from neutron_lib import constants
 import six
 import unittest2
 
 import neutron
 from neutron.api.v2 import attributes
-from neutron.common import constants
+from neutron.common import constants as n_const
 from neutron.common import ipv6_utils
 
 
@@ -233,14 +234,14 @@ def get_random_integer(range_begin=0, range_end=1000):
 
 
 def get_random_prefixlen(version=4):
-    maxlen = constants.IPV4_MAX_PREFIXLEN
+    maxlen = constants.IPv4_BITS
     if version == 6:
-        maxlen = constants.IPV6_MAX_PREFIXLEN
+        maxlen = constants.IPv6_BITS
     return random.randint(0, maxlen)
 
 
 def get_random_ip_version():
-    return random.choice(constants.IP_ALLOWED_VERSIONS)
+    return random.choice(n_const.IP_ALLOWED_VERSIONS)
 
 
 def get_random_cidr(version=4):
@@ -302,4 +303,4 @@ def reset_random_seed():
 
 
 def get_random_ipv6_mode():
-    return random.choice(constants.IPV6_MODES)
+    return random.choice(n_const.IPV6_MODES)
diff --git a/neutron/tests/unit/plugins/ml2/extensions/test_dns_integration.py b/neutron/tests/unit/plugins/ml2/extensions/test_dns_integration.py
index c3e1e8fed88..364ebfe15e8 100644
--- a/neutron/tests/unit/plugins/ml2/extensions/test_dns_integration.py
+++ b/neutron/tests/unit/plugins/ml2/extensions/test_dns_integration.py
@@ -15,6 +15,7 @@
 
 import mock
 import netaddr
+from neutron_lib import constants
 
 from neutron import context
 from neutron.db import dns_db
@@ -235,8 +236,10 @@ class DNSIntegrationTestCase(test_plugin.Ml2PluginV2TestCase):
     def _get_bytes_or_nybles_to_skip(self, in_addr_name):
         if 'in-addr.arpa' in in_addr_name:
             return ((
-                32 - config.cfg.CONF.designate.ipv4_ptr_zone_prefix_size) / 8)
-        return (128 - config.cfg.CONF.designate.ipv6_ptr_zone_prefix_size) / 4
+                constants.IPv4_BITS -
+                config.cfg.CONF.designate.ipv4_ptr_zone_prefix_size) / 8)
+        return (constants.IPv6_BITS -
+                config.cfg.CONF.designate.ipv6_ptr_zone_prefix_size) / 4
 
     def test_create_port(self, *mocks):
         config.cfg.CONF.set_override('dns_domain', DNSDOMAIN)