diff --git a/python/nova-understack/ironic_understack/conf.py b/python/nova-understack/ironic_understack/conf.py
index 62f6e82ee..85df4395b 100644
--- a/python/nova-understack/ironic_understack/conf.py
+++ b/python/nova-understack/ironic_understack/conf.py
@@ -27,6 +27,26 @@ def setup_conf():
             help="Controls if Nova should inject storage IPs to config drive.",
             default=True,
         ),
+        cfg.StrOpt(
+            "storage_target_a_prefix",
+            help="Storage Networking Target Prefix A-side",
+            default="100.127.0.0/17",
+        ),
+        cfg.StrOpt(
+            "storage_target_b_prefix",
+            help="Storage Networking Target Prefix B-side",
+            default="100.127.128.0/17",
+        ),
+        cfg.StrOpt(
+            "storage_client_a_prefix",
+            help="Storage Networking Client Prefix A-side",
+            default="100.126.0.0/17",
+        ),
+        cfg.StrOpt(
+            "storage_client_b_prefix",
+            help="Storage Networking Client Prefix B-side",
+            default="100.126.128.0/17",
+        ),
     ]
     cfg.CONF.register_group(grp)
     cfg.CONF.register_opts(opts, group=grp)
diff --git a/python/nova-understack/ironic_understack/nautobot_client.py b/python/nova-understack/ironic_understack/nautobot_client.py
index 2a0a1c2f0..488bbc6ea 100644
--- a/python/nova-understack/ironic_understack/nautobot_client.py
+++ b/python/nova-understack/ironic_understack/nautobot_client.py
@@ -4,6 +4,7 @@
 from uuid import UUID
 
 import requests
+from oslo_config import cfg
 
 
 @dataclass
@@ -30,12 +31,20 @@ def address(self) -> str:
     @property
     def target_network(self) -> ipaddress.IPv4Network:
         """Returns the respective target-side network."""
-        third_octet = self.address.split(".")[2]
-        if third_octet not in ["0", "128"]:
+        nova_us_cfg = cfg.CONF.nova_understack
+        target_a_prefix = ipaddress.IPv4Network(nova_us_cfg.storage_target_a_prefix)
+        target_b_prefix = ipaddress.IPv4Network(nova_us_cfg.storage_target_b_prefix)
+        client_a_prefix = ipaddress.IPv4Network(nova_us_cfg.storage_client_a_prefix)
+        client_b_prefix = ipaddress.IPv4Network(nova_us_cfg.storage_client_b_prefix)
+
+        if self.interface.ip in client_a_prefix:
+            return target_a_prefix
+        elif self.interface.ip in client_b_prefix:
+            return target_b_prefix
+        else:
             raise ValueError(
-                f"Cannot determine the target-side network from {self.address}"
+                f"Cannot determine the target-side network from {self.interface}"
             )
-        return ipaddress.IPv4Network(f"100.127.{third_octet}.0/24")
 
     @property
     def address_with_prefix(self) -> str:
diff --git a/python/nova-understack/tests/test_nautobot_client.py b/python/nova-understack/tests/test_nautobot_client.py
index 1cce76083..81408bbfc 100644
--- a/python/nova-understack/tests/test_nautobot_client.py
+++ b/python/nova-understack/tests/test_nautobot_client.py
@@ -54,16 +54,16 @@ def test_network_property(self):
 
     def test_target_network_octet_0(self):
         """Test target_network calculation for third octet 0."""
-        ip = IPAddress.from_address_string("100.127.0.10/24")
+        ip = IPAddress.from_address_string("100.126.0.10/24")
 
-        expected_network = ipaddress.IPv4Network("100.127.0.0/24")
+        expected_network = ipaddress.IPv4Network("100.127.0.0/17")
         assert ip.target_network == expected_network
 
     def test_target_network_octet_128(self):
         """Test target_network calculation for third octet 128."""
-        ip = IPAddress.from_address_string("100.127.128.10/24")
+        ip = IPAddress.from_address_string("100.126.128.10/24")
 
-        expected_network = ipaddress.IPv4Network("100.127.128.0/24")
+        expected_network = ipaddress.IPv4Network("100.127.128.0/17")
         assert ip.target_network == expected_network
 
     def test_target_network_invalid_octet(self):
@@ -230,7 +230,7 @@ def test_as_openstack_network(self):
         """Test OpenStack network generation."""
         # Create IP with specific values for predictable gateway calculation
         ip_assignment = IPAddressAssignment(
-            ip_address=IPAddress.from_address_string("100.127.0.10/24")
+            ip_address=IPAddress.from_address_string("100.126.0.10/24")
         )
         interface = Interface(
             id="interface-1",
@@ -247,13 +247,13 @@ def test_as_openstack_network(self):
             "id": "network-for-if5",
             "type": "ipv4",
             "link": "tap-stor-5",
-            "ip_address": "100.127.0.10",
+            "ip_address": "100.126.0.10",
             "netmask": "255.255.255.0",
             "routes": [
                 {
                     "network": "100.127.0.0",
-                    "netmask": "255.255.255.0",
-                    "gateway": "100.127.0.1",
+                    "netmask": "255.255.128.0",
+                    "gateway": "100.126.0.1",
                 }
             ],
             "network_id": "test-network-id",
@@ -554,7 +554,7 @@ def test_generate_network_config_all_interfaces(self):
                     mac_address="aa:bb:cc:dd:ee:ff",
                     ip_address_assignments=[
                         IPAddressAssignment(
-                            ip_address=IPAddress.from_address_string("100.127.0.10/24")
+                            ip_address=IPAddress.from_address_string("100.126.0.10/24")
                         )
                     ],
                 ),
@@ -564,7 +564,7 @@ def test_generate_network_config_all_interfaces(self):
                     ip_address_assignments=[
                         IPAddressAssignment(
                             ip_address=IPAddress.from_address_string(
-                                "100.127.128.10/24"
+                                "100.126.128.10/24"
                             )
                         )
                     ],