diff --git a/ajax/networking/get_frequencies.php b/ajax/networking/get_frequencies.php
new file mode 100644
index 00000000..3d2a48d9
--- /dev/null
+++ b/ajax/networking/get_frequencies.php
@@ -0,0 +1,27 @@
+<?php
+
+require '../../includes/csrf.php';
+require_once '../../includes/config.php';
+
+if (isset($_POST['interface'])) {
+
+    define( 'NL80211_BAND_24GHZ', 0x1 );
+    define( 'NL80211_BAND_5GHZ', 0x2 );
+    $iface = escapeshellcmd($_POST['interface']);
+
+    // get physical device for selected interface
+    exec("iw dev | awk '/$iface/ {print line}{line = $0}'", $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) {
+        $flags += NL80211_BAND_5GHZ;
+    }
+    echo json_encode($flags);
+}
+