diff --git a/ajax/networking/get_frequencies.php b/ajax/networking/get_frequencies.php
index 156413b0..ba85a386 100644
--- a/ajax/networking/get_frequencies.php
+++ b/ajax/networking/get_frequencies.php
@@ -1,43 +1,20 @@
 <?php
 
 require '../../includes/csrf.php';
-require_once '../../includes/config.php';
-require_once '../../includes/locale.php';
+require '../../src/RaspAP/Parsers/IwParser.php';
 
 if (isset($_POST['interface'])) {
 
-    define( 'NL80211_BAND_24GHZ', 0x1 );
-    define( 'NL80211_BAND_5GHZ', 0x2 );
     $iface = escapeshellcmd($_POST['interface']);
-    $flags = 0;
+    $parser = new \RaspAP\Parsers\IwParser($iface);
 
-    // get physical device for selected interface
-    exec("iw dev | awk -v iface=".$iface." '/^phy#/ { phy = $0 } $1 == \"Interface\" { interface = $2 } interface == iface { print phy }'", $return);
-    $phy = $return[0];
+    $supportedFrequencies = $parser->parseIwList($iface);
 
-    // get frequencies supported by device
-    exec('iw '.$phy.' info | sed -rn "s/^.*\*\s([0-9]{4})\sMHz.*/\1/p"', $frequencies);
-    
-    if (count(preg_grep('/^24[0-9]{2}/i', $frequencies)) >0) {
-        $flags += NL80211_BAND_24GHZ;
-    }
-    if (count(preg_grep('/^5[0-9]{3}/i', $frequencies)) >0) {
-        $flags += NL80211_BAND_5GHZ;
-    }
+    # debug
+    #foreach ($supportedFrequencies as $frequency) {
+    #    echo "<br>Frequency: {$frequency['MHz']} MHz, Channel: {$frequency['Channel']}, dBm: {$frequency['dBm']}\n";
+    #}
 
-    switch ($flags) {
-    case NL80211_BAND_24GHZ:
-        $msg = sprintf(_("The selected interface (%s) has support for the 2.4 GHz wireless band only."), $iface);
-        break;
-    case NL80211_BAND_5GHZ:
-        $msg = sprintf(_("The selected interface (%s) has support for the 5 GHz wireless band only."), $iface);
-        break;
-    case NL80211_BAND_24GHZ | NL80211_BAND_5GHZ:
-        $msg = sprintf(_("The selected interface (%s) has support for both the 2.4 and 5 GHz wireless bands."), $iface);
-        break;
-    default:
-        $msg = sprintf(_("The selected interface (%s) does not support wireless mode operation."), $iface);
-    }
-    echo json_encode($msg);
+    echo json_encode($supportedFrequencies);
 }
 
diff --git a/ajax/networking/get_nl80211_band.php b/ajax/networking/get_nl80211_band.php
new file mode 100644
index 00000000..156413b0
--- /dev/null
+++ b/ajax/networking/get_nl80211_band.php
@@ -0,0 +1,43 @@
+<?php
+
+require '../../includes/csrf.php';
+require_once '../../includes/config.php';
+require_once '../../includes/locale.php';
+
+if (isset($_POST['interface'])) {
+
+    define( 'NL80211_BAND_24GHZ', 0x1 );
+    define( 'NL80211_BAND_5GHZ', 0x2 );
+    $iface = escapeshellcmd($_POST['interface']);
+    $flags = 0;
+
+    // get physical device for selected interface
+    exec("iw dev | awk -v iface=".$iface." '/^phy#/ { phy = $0 } $1 == \"Interface\" { interface = $2 } interface == iface { print phy }'", $return);
+    $phy = $return[0];
+
+    // get frequencies supported by device
+    exec('iw '.$phy.' info | sed -rn "s/^.*\*\s([0-9]{4})\sMHz.*/\1/p"', $frequencies);
+    
+    if (count(preg_grep('/^24[0-9]{2}/i', $frequencies)) >0) {
+        $flags += NL80211_BAND_24GHZ;
+    }
+    if (count(preg_grep('/^5[0-9]{3}/i', $frequencies)) >0) {
+        $flags += NL80211_BAND_5GHZ;
+    }
+
+    switch ($flags) {
+    case NL80211_BAND_24GHZ:
+        $msg = sprintf(_("The selected interface (%s) has support for the 2.4 GHz wireless band only."), $iface);
+        break;
+    case NL80211_BAND_5GHZ:
+        $msg = sprintf(_("The selected interface (%s) has support for the 5 GHz wireless band only."), $iface);
+        break;
+    case NL80211_BAND_24GHZ | NL80211_BAND_5GHZ:
+        $msg = sprintf(_("The selected interface (%s) has support for both the 2.4 and 5 GHz wireless bands."), $iface);
+        break;
+    default:
+        $msg = sprintf(_("The selected interface (%s) does not support wireless mode operation."), $iface);
+    }
+    echo json_encode($msg);
+}
+
diff --git a/app/js/custom.js b/app/js/custom.js
index 175a609a..3c2a45f4 100644
--- a/app/js/custom.js
+++ b/app/js/custom.js
@@ -185,7 +185,7 @@ function contentLoaded() {
             setupBtns();
             break;
         case "hostapd_conf":
-            loadChannel();
+            getChannel();
             setHardwareModeTooltip();
             break;
         case "dhcpd_conf":
@@ -264,13 +264,6 @@ function setDHCPToggles(state) {
     $('#dhcp-iface').prop('disabled', !state);
 }
 
-function loadChannel() {
-    $.get('ajax/networking/get_channel.php',function(data){
-        jsonData = JSON.parse(data);
-        loadChannelSelect(jsonData);
-    });
-}
-
 $('#debugModal').on('shown.bs.modal', function (e) {
   var csrfToken = $('meta[name=csrf_token]').attr('content');
   $.post('ajax/system/sys_debug.php',{'csrf_token': csrfToken},function(data){
@@ -391,53 +384,76 @@ $(".custom-file-input").on("change", function() {
   $(this).siblings(".custom-file-label").addClass("selected").html(fileName);
 });
 
-/*
-Sets the wirelss channel select options based on hw_mode and country_code.
-
-Methodology: In North America up to channel 11 is the maximum allowed WiFi 2.4Ghz channel,
-except for the US that allows channel 12 & 13 in low power mode with additional restrictions.
-Canada allows channel 12 in low power mode. Because it's unsure if low powered mode can be
-supported the channels are not selectable for those countries. Also Uzbekistan and Colombia
-allow up to channel 11 as maximum channel on the 2.4Ghz WiFi band.
-Source: https://en.wikipedia.org/wiki/List_of_WLAN_channels
-Additional: https://git.kernel.org/pub/scm/linux/kernel/git/sforshee/wireless-regdb.git
-*/
-function loadChannelSelect(selected) {
-    // Fetch wireless regulatory data
-    $.getJSON("config/wireless.json", function(json) {
-        var hw_mode = $('#cbxhwmode').val();
-        var country_code = $('#cbxcountries').val();
-        var channel_select = $('#cbxchannel');
-        var data = json["wireless_regdb"];
-        var selectablechannels = Array.range(1,14);
-
-        // Assign array of countries to valid frequencies (channels)
-        var countries_2_4Ghz_max11ch = data["2_4GHz_max11ch"].countries;
-        var countries_2_4Ghz_max14ch = data["2_4GHz_max14ch"].countries;
-        var countries_5Ghz_max48ch = data["5Ghz_max48ch"].countries;
-
-        // Map selected hw_mode and country to determine channel list
-        if (hw_mode === 'a') {
-            selectablechannels = data["5Ghz_max48ch"].channels;
-        } else if (($.inArray(country_code, countries_2_4Ghz_max11ch) !== -1) && (hw_mode !== 'ac') ) {
-            selectablechannels = data["2_4GHz_max11ch"].channels;
-        } else if (($.inArray(country_code, countries_2_4Ghz_max14ch) !== -1) && (hw_mode === 'b')) {
-            selectablechannels = data["2_4GHz_max14ch"].channels;
-        } else if (($.inArray(country_code, countries_5Ghz_max48ch) !== -1) && (hw_mode === 'ac')) {
-            selectablechannels = data["5Ghz_max48ch"].channels;
-        }
-
-        // Set channel select with available values
-        selected = (typeof selected === 'undefined') ? selectablechannels[0] : selected;
-        channel_select.empty();
-        $.each(selectablechannels, function(key,value) {
-            channel_select.append($("<option></option>").attr("value", value).text(value));
-        });
-        channel_select.val(selected);
+ // Retrieves the 'channel' value specified in hostapd.conf
+function getChannel() {
+    $.get('ajax/networking/get_channel.php',function(data){
+        jsonData = JSON.parse(data);
+        loadChannelSelect(jsonData);
     });
 }
 
-/* Sets hardware mode tooltip text for selected interface.
+/*
+ Sets the wirelss channel select options based on frequencies reported by iw.
+
+ See: https://git.kernel.org/pub/scm/linux/kernel/git/sforshee/wireless-regdb.git
+ Also: https://en.wikipedia.org/wiki/List_of_WLAN_channels
+*/
+function loadChannelSelect(selected) {
+    var iface = $('#cbxinterface').val();
+    var hwmodeText = '';
+    var csrfToken = $('meta[name=csrf_token]').attr('content');
+
+    // update hardware mode tooltip
+    setHardwareModeTooltip();
+
+    $.post('ajax/networking/get_frequencies.php',{'interface': iface, 'csrf_token': csrfToken, 'selected': selected},function(response){
+        var hw_mode = $('#cbxhwmode').val();
+        var country_code = $('#cbxcountries').val();
+        var channel_select = $('#cbxchannel');
+        var btn_save = $('#btnSaveHostapd');
+        var data = JSON.parse(response);
+        var selectableChannels = [];
+
+        // Map selected hw_mode to available channels
+        if (hw_mode === 'a') {
+            selectableChannels = data.filter(item => item.MHz.toString().startsWith('5'));
+        } else if (hw_mode !== 'ac') {
+            selectableChannels = data.filter(item => item.MHz.toString().startsWith('24'));
+        } else if (hw_mode === 'b') {
+            selectableChannels = data.filter(item => item.MHz.toString().startsWith('24'));
+        } else if (hw_mode === 'ac') {
+            selectableChannels = data.filter(item => item.MHz.toString().startsWith('5'));
+        }
+
+        // If selected channel doeesn't exist in allowed channels, set default or null (unsupported)
+        if (!selectableChannels.find(item => item.Channel === selected)) {
+            if (selectableChannels.length === 0) {
+                selectableChannels[0] = { Channel: null };
+            } else {
+                defaultChannel = selectableChannels[0].Channel;
+                selected = defaultChannel
+            }
+        }
+
+        // Set channel select with available values
+        channel_select.empty();
+        if (selectableChannels[0].Channel === null) {
+            channel_select.append($("<option></option>").attr("value", "").text("---"));
+            channel_select.prop("disabled", true);
+            btn_save.prop("disabled", true);
+        } else {
+            channel_select.prop("disabled", false);
+            btn_save.prop("disabled", false);
+            $.each(selectableChannels, function(key,value) {
+                channel_select.append($("<option></option>").attr("value", value.Channel).text(value.Channel));
+            });
+            channel_select.val(selected);
+        }
+    });
+}
+
+/* Sets hardware mode tooltip text for selected interface
+ * and calls loadChannelSelect()
  */
 function setHardwareModeTooltip() {
     var iface = $('#cbxinterface').val();
@@ -447,7 +463,7 @@ function setHardwareModeTooltip() {
     if ($('#cbxhwmode').find('option[value="ac"]').prop('disabled') == true ) {
         var hwmodeText = $('#hwmode').attr('data-tooltip');
     }
-    $.post('ajax/networking/get_frequencies.php?',{'interface': iface, 'csrf_token': csrfToken},function(data){
+    $.post('ajax/networking/get_nl80211_band.php?',{'interface': iface, 'csrf_token': csrfToken},function(data){
         var responseText = JSON.parse(data);
         $('#tiphwmode').attr('data-original-title', responseText + '\n' + hwmodeText );
     });
diff --git a/src/RaspAP/Parsers/IwParser.php b/src/RaspAP/Parsers/IwParser.php
index 324935cf..7eba393e 100644
--- a/src/RaspAP/Parsers/IwParser.php
+++ b/src/RaspAP/Parsers/IwParser.php
@@ -28,7 +28,6 @@ class IwParser {
     }
 
     public function parseIwList() {
-        
         /**
          * (no IR): the AP won't Initiate Radiation until a DFS scan (or similar) is complete on these bands.
          * (radar detection): the specified channels are shared with radar equipment.