diff --git a/classes/local/outagelib.php b/classes/local/outagelib.php
index 5a09ace..6d76759 100644
--- a/classes/local/outagelib.php
+++ b/classes/local/outagelib.php
@@ -168,7 +168,12 @@ class outagelib {
             }
         }
 
-        return (object)array_merge(self::get_config_defaults(), $config);
+        $config = array_merge(self::get_config_defaults(), $config);
+        // Combine allowed IPs config values together.
+        if (isset($config['allowedips_forced'])) {
+            $config['allowedips'] = trim($config['allowedips'] . "\n" . $config['allowedips_forced']);
+        }
+        return (object)$config;
     }
 
     /**
diff --git a/lang/en/auth_outage.php b/lang/en/auth_outage.php
index 8842f8a..3192e85 100644
--- a/lang/en/auth_outage.php
+++ b/lang/en/auth_outage.php
@@ -158,6 +158,10 @@ $string['warningduration'] = 'Warning duration';
 $string['warningduration_help'] = 'How long before the start of the outage should the warning be displayed.';
 $string['warningreenablemaintenancemode'] = 'Please note that saving this outage will re-enable maintenance mode.<br />Untick "Auto start maintenance mode" if you want to prevent this.';
 
+$string['builtinallowediplist'] = 'Builtin Allowed IP List';
+$string['builtinallowediplist_desc'] = 'Allowed IP list defined via configuration';
+$string['ips_combine'] = 'The IPs listed above will be combined with the IPs listed below.';
+
 /*
  * Privacy provider (GDPR)
  */
diff --git a/settings.php b/settings.php
index c86670e..cfb919e 100644
--- a/settings.php
+++ b/settings.php
@@ -110,6 +110,8 @@ if ($hassiteconfig && is_enabled_auth('outage')) {
     $description .= $OUTPUT->notification(get_string($message, 'auth_outage', ['ip' => getremoteaddr()]), $type);
 
     $description .= '<p>'.get_string('ipblockersyntax', 'admin').'</p>';
+    $description .= '<p>'.get_string('ips_combine', 'auth_outage').'</p>';
+
     $iplist = new admin_setting_configiplist(
         'auth_outage/allowedips',
         get_string('allowediplist', 'admin'),
@@ -119,6 +121,14 @@ if ($hassiteconfig && is_enabled_auth('outage')) {
     $iplist->set_updatedcallback('auth_outage_outagelib_prepare_next_outage');
     $settings->add($iplist);
 
+    $iplist = new admin_setting_configiplist(
+        'auth_outage/allowedips_forced',
+        get_string('builtinallowediplist', 'auth_outage'),
+        get_string('builtinallowediplist_desc', 'auth_outage'),
+        ''
+    );
+    $settings->add($iplist);
+
     // Create 'Static Page - Elements to Remove' settings.
     $toremove = new admin_setting_configtextarea(
         'auth_outage/remove_selectors',
diff --git a/tests/phpunit/local/outagelib_test.php b/tests/phpunit/local/outagelib_test.php
index 2a7b687..942fa1b 100644
--- a/tests/phpunit/local/outagelib_test.php
+++ b/tests/phpunit/local/outagelib_test.php
@@ -216,6 +216,10 @@ class auth_outage_outagelib_test extends auth_outage_base_testcase {
         foreach ($keys as $k) {
             self::assertSame($config->$k, $k.'_value', 'auth_outage');
         }
+
+        set_config('allowedips_forced', 'allowedips_forced_value', 'auth_outage');
+        $config = outagelib::get_config();
+        self::assertSame($config->allowedips, "allowedips_value\nallowedips_forced_value", 'auth_outage');
     }
 
     /**
@@ -336,8 +340,10 @@ EOT;
 
     /**
      * Test create maintenance php code without age
+     *
+     * @dataProvider test_createmaintenancephpcode_withoutage_provider
      */
-    public function test_createmaintenancephpcode_withoutage() {
+    public function test_createmaintenancephpcode_withoutage($configkey) {
         global $CFG;
         $this->resetAfterTest(true);
 
@@ -380,7 +386,7 @@ EOT;
             'stoptime' => 456,
         ]);
         $file = $CFG->dataroot.'/climaintenance.php';
-        set_config('allowedips', '127.0.0.1', 'auth_outage');
+        set_config($configkey, '127.0.0.1', 'auth_outage');
 
         outagelib::update_climaintenance_code($outage);
         self::assertFileExists($file);
@@ -388,6 +394,10 @@ EOT;
         self::assertSame($found, $expected);
     }
 
+    public function test_createmaintenancephpcode_withoutage_provider(): array {
+        return [['allowedips'], ['allowedips_forced']];
+    }
+
     /**
      * Test create maintenance php code without IPs
      */
@@ -401,6 +411,7 @@ EOT;
         ]);
         $file = $CFG->dataroot.'/climaintenance.php';
         set_config('allowedips', '', 'auth_outage');
+        set_config('allowedips_forced', '', 'auth_outage');
 
         touch($file);
         outagelib::update_climaintenance_code($outage);
diff --git a/version.php b/version.php
index 4925c76..304b90b 100644
--- a/version.php
+++ b/version.php
@@ -28,8 +28,8 @@
 defined('MOODLE_INTERNAL') || die();
 
 $plugin->component = "auth_outage";
-$plugin->version = 2022011400;                  // The current plugin version (Date: YYYYMMDDXX).
-$plugin->release = 2022011400;                  // Human-readable release information.
+$plugin->version = 2022042800;                  // The current plugin version (Date: YYYYMMDDXX).
+$plugin->release = 2022042800;                  // Human-readable release information.
 $plugin->requires = 2017111309;                 // 2017111309 = T13, but this really requires 3.9 and higher.
 $plugin->maturity = MATURITY_STABLE;            // Suitable for PRODUCTION environments!
 $plugin->supported = [39, 311];                 // A range of branch numbers of supported moodle versions.