diff --git a/htdocs/map.js b/htdocs/map.js
index af879d0..9a5141f 100644
--- a/htdocs/map.js
+++ b/htdocs/map.js
@@ -37,6 +37,7 @@ $(function(){
     var retention_time = 2 * 60 * 60 * 1000;
     var strokeOpacity = 0.8;
     var fillOpacity = 0.35;
+    var callsign_url = null;
 
     var colorKeys = {};
     var colorScale = chroma.scale(['red', 'blue', 'green']).mode('hsl');
@@ -286,6 +287,9 @@ $(function(){
                         if ('map_position_retention_time' in config) {
                             retention_time = config.map_position_retention_time * 1000;
                         }
+                        if ('callsign_url' in config) {
+                            callsign_url = config['callsign_url'];
+                        }
                     break;
                     case "update":
                         processUpdates(json.value);
@@ -340,6 +344,15 @@ $(function(){
         return infowindow;
     }
 
+    var linkifyCallsign = function(callsign) {
+        if ((callsign_url == null) || (callsign_url == ''))
+            return callsign;
+        else
+            return '<a href="#" onclick="window.open(' + "'" +
+                callsign_url.replaceAll('{}', callsign) +
+                "','callsign_info'" + ');">' + callsign + '</a>';
+    };
+
     var infowindow;
     var showLocatorInfoWindow = function(locator, pos) {
         var infowindow = getInfoWindow();
@@ -357,7 +370,7 @@ $(function(){
             '<ul>' +
                 inLocator.map(function(i){
                     var timestring = moment(i.lastseen).fromNow();
-                    var message = i.callsign + ' (' + timestring + ' using ' + i.mode;
+                    var message = linkifyCallsign(i.callsign) + ' (' + timestring + ' using ' + i.mode;
                     if (i.band) message += ' on ' + i.band;
                     message += ')';
                     return '<li>' + message + '</li>'
@@ -378,7 +391,7 @@ $(function(){
             commentString = '<div>' + marker.comment + '</div>';
         }
         infowindow.setContent(
-            '<h3>' + callsign + '</h3>' +
+            '<h3>' + linkifyCallsign(callsign) + '</h3>' +
             '<div>' + timestring + ' using ' + marker.mode + ( marker.band ? ' on ' + marker.band : '' ) + '</div>' +
             commentString
         );
diff --git a/owrx/config/defaults.py b/owrx/config/defaults.py
index f03dded..203c257 100644
--- a/owrx/config/defaults.py
+++ b/owrx/config/defaults.py
@@ -147,6 +147,7 @@ defaultConfig = PropertyLayer(
     squelch_auto_margin=10,
     google_maps_api_key="",
     map_position_retention_time=2 * 60 * 60,
+    callsign_url="https://www.qrzcq.com/call/{}",
     decoding_queue_workers=2,
     decoding_queue_length=10,
     wsjt_decoding_depth=3,
diff --git a/owrx/connection.py b/owrx/connection.py
index 699da31..dfb526c 100644
--- a/owrx/connection.py
+++ b/owrx/connection.py
@@ -456,6 +456,7 @@ class MapConnection(OpenWebRxClient):
             "google_maps_api_key",
             "receiver_gps",
             "map_position_retention_time",
+            "callsign_url",
             "receiver_name",
         )
         filtered_config.wire(self.write_config)
diff --git a/owrx/controllers/settings/general.py b/owrx/controllers/settings/general.py
index 232c543..7958368 100644
--- a/owrx/controllers/settings/general.py
+++ b/owrx/controllers/settings/general.py
@@ -168,6 +168,13 @@ class GeneralSettingsController(SettingsFormController):
                     infotext="Specifies how log markers / grids will remain visible on the map",
                     append="s",
                 ),
+                TextInput(
+                    "callsign_url",
+                    "Callsign database URL",
+                    infotext="Specifies callsign lookup URL, such as QRZ.COM "
+                    + "or QRZCQ.COM. Place curly brackers ({}) where callsign "
+                    + "is supposed to be.",
+                ),
             ),
         ]