diff --git a/Z4D_decoders/z4d_decoder_IEEE_addr_req.py b/Z4D_decoders/z4d_decoder_IEEE_addr_req.py
index abc8ed351..69121aba0 100644
--- a/Z4D_decoders/z4d_decoder_IEEE_addr_req.py
+++ b/Z4D_decoders/z4d_decoder_IEEE_addr_req.py
@@ -1,34 +1,62 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+#
+# Implementation of Zigbee for Domoticz plugin.
+#
+# This file is part of Zigbee for Domoticz plugin. https://github.com/zigbeefordomoticz/Domoticz-Zigbee
+# (C) 2015-2024
+#
+# Initial authors: zaraki673 & pipiche38
+#
+# SPDX-License-Identifier:    GPL-3.0 license
+
 import struct
 
 from Modules.sendZigateCommand import raw_APS_request
 
 
 def Decode0041(self, Devices, MsgData, MsgLQI):
-    self.log.logging('Input', 'Debug', 'Decode0041 - IEEE_addr_req: %s %s %s' % (MsgData, self.ControllerNWKID, self.ControllerIEEE))
+    self.log.logging('Input', 'Debug', f"Decode0041 - IEEE_addr_req: {MsgData} {self.ControllerNWKID} {self.ControllerIEEE}")
+    
+    if not self.ControllerIEEE or self.ControllerNWKID in (None, "ffff"):
+        return
+
+    # Parse message data
+    sqn, srcNwkId, srcEp, nwkid, reqType, startIndex = ( MsgData[:2], MsgData[2:6], MsgData[6:8], MsgData[8:12], MsgData[12:14], MsgData[14:16] )
+
+    # Log parsed details
+    self.log.logging('Input', 'Debug', f"      source req SrcNwkId: {srcNwkId} NwkId: {nwkid} Type: {reqType} Idx: {startIndex}")
     
-    sqn = MsgData[:2]
-    srcNwkId = MsgData[2:6]
-    srcEp = MsgData[6:8]
-    nwkid = MsgData[8:12]
-    reqType = MsgData[12:14]
-    startIndex = MsgData[14:16]
-    self.log.logging('Input', 'Debug', '      source req nwkid: %s' % srcNwkId)
-    self.log.logging('Input', 'Debug', '      request NwkId    : %s' % nwkid)
-    self.log.logging('Input', 'Debug', '      request Type    : %s' % reqType)
-    self.log.logging('Input', 'Debug', '      request Idx     : %s' % startIndex)
     Cluster = '8001'
+    status, payload = _generate_response_payload(self, nwkid, sqn)
+    
+    self.log.logging('Input', 'Debug', f"Decode0041 - response payload: {payload}")
+    raw_APS_request(self, srcNwkId, '00', Cluster, '0000', payload, zigpyzqn=sqn, zigate_ep='00')
+
+
+def _generate_response_payload(self, nwkid, sqn):
+    """Generate the response payload based on the requested nwkid."""
     if nwkid == self.ControllerNWKID:
         status = '00'
-        controller_ieee = '%016x' % struct.unpack('Q', struct.pack('>Q', int(self.ControllerIEEE, 16)))[0]
-        controller_nwkid = '%04x' % struct.unpack('H', struct.pack('>H', int(self.ControllerNWKID, 16)))[0]
-        payload = sqn + status + controller_ieee + controller_nwkid + '00'
+        ieee = _format_ieee(self, self.ControllerIEEE)
+        nwk_id = _format_nwkid(self, self.ControllerNWKID)
+        payload = sqn + status + ieee + nwk_id + '00'
     elif nwkid in self.ListOfDevices:
         status = '00'
-        device_ieee = '%016x' % struct.unpack('Q', struct.pack('>Q', int(self.ListOfDevices[nwkid]['IEEE'], 16)))[0]
-        device_nwkid = '%04x' % struct.unpack('H', struct.pack('>H', int(self.ControllerNWKID, 16)))[0]
-        payload = sqn + status + device_ieee + device_nwkid + '00'
+        ieee = _format_ieee(self, self.ListOfDevices[nwkid]['IEEE'])
+        nwk_id = _format_nwkid(self, self.ControllerNWKID)
+        payload = sqn + status + ieee + nwk_id + '00'
     else:
         status = '81'
         payload = sqn + status + nwkid
-    self.log.logging('Input', 'Debug', 'Decode0041 - response payload: %s' % payload)
-    raw_APS_request(self, srcNwkId, '00', Cluster, '0000', payload, zigpyzqn=sqn, zigate_ep='00')
\ No newline at end of file
+    return status, payload
+
+
+def _format_ieee(self, ieee):
+    """Format the IEEE address to 16-character hex string."""
+    return f"{int(ieee, 16):016x}"
+
+
+def _format_nwkid(self, nwkid):
+    """Format the NWK ID to 4-character hex string."""
+    return f"{int(nwkid, 16):04x}"