diff --git a/app/js/custom.js b/app/js/custom.js
index 7c874fd6..8cbeeecf 100644
--- a/app/js/custom.js
+++ b/app/js/custom.js
@@ -468,6 +468,14 @@ $(document).ready(function(){
         },
         placeholder: "___.___.___.___"
     });
+    $('.date').mask('FF:FF:FF:FF:FF:FF', {
+        translation: {
+            "F": {
+                pattern: /[0-9a-z]/, optional: true
+            }
+        },
+        placeholder: "__:__:__:__:__:__"
+    });
 });
 
 $('#wg-upload,#wg-manual').on('click', function (e) {
diff --git a/templates/dhcp/static_leases.php b/templates/dhcp/static_leases.php
index c1e090c4..90e24352 100644
--- a/templates/dhcp/static_leases.php
+++ b/templates/dhcp/static_leases.php
@@ -30,7 +30,7 @@
 
       <div class="row dhcp-static-lease-row js-new-dhcp-static-lease">
         <div class="col-md-4 col-xs-3">
-          <input type="text" name="mac" value="" placeholder="<?php echo _("MAC address") ?>" class="form-control" autofocus="autofocus">
+          <input type="text" name="mac" value="" placeholder="<?php echo _("MAC address") ?>" class="form-control date" autofocus="autofocus">
         </div>
         <div class="col-md-3 col-xs-3">
           <input type="text" name="ip" value="" placeholder="<?php echo _("IP address") ?>" class="form-control ip_address" maxlength="15">