diff --git a/matrixbox_simulator/device/cpstubs/wifi.py b/matrixbox_simulator/device/cpstubs/wifi.py
index b84e5bb..08da0d6 100644
--- a/matrixbox_simulator/device/cpstubs/wifi.py
+++ b/matrixbox_simulator/device/cpstubs/wifi.py
@@ -7,6 +7,12 @@
 only special-cases the real CircuitPython name.
 """
 
+import os
+
+_LOCAL_IPV4_ADDRESS = (
+    f"127.0.0.1:{os.environ.get('MATRIXBOX_SIMULATOR_HTTP_PORT', '8080')}"
+)
+
 
 class Radio:
     def __init__(self) -> None:
@@ -14,8 +20,8 @@ def __init__(self) -> None:
         self.ap_active: bool = False
         self.mac_address: bytes = bytes([0x02, 0x00, 0x00, 0x45, 0x53, 0x50])
         self.tx_power: float = 0.0
-        self.ipv4_address: str | None = None
-        self.ipv4_address_ap: str | None = None
+        self.ipv4_address: str | None = _LOCAL_IPV4_ADDRESS
+        self.ipv4_address_ap: str | None = _LOCAL_IPV4_ADDRESS
 
     def connect(
         self, ssid: str, password: str, *, channel: int = 0, timeout: float = 15