diff --git a/security/acme-client/src/opnsense/mvc/app/controllers/OPNsense/AcmeClient/forms/dialogValidation.xml b/security/acme-client/src/opnsense/mvc/app/controllers/OPNsense/AcmeClient/forms/dialogValidation.xml
index 0d6d449c5..0d5997740 100644
--- a/security/acme-client/src/opnsense/mvc/app/controllers/OPNsense/AcmeClient/forms/dialogValidation.xml
+++ b/security/acme-client/src/opnsense/mvc/app/controllers/OPNsense/AcmeClient/forms/dialogValidation.xml
@@ -1098,6 +1098,21 @@
         <type>textbox</type>
         <help>Requires the whole key file in a format that is compatible with TransIP.</help>
     </field>
+    <field>
+        <label>united-domains Reselling</label>
+        <type>header</type>
+        <style>table_dns table_dns_udr</style>
+    </field>
+    <field>
+        <id>validation.dns_udr_user</id>
+        <label>User</label>
+        <type>text</type>
+    </field>
+    <field>
+        <id>validation.dns_udr_password</id>
+        <label>Password</label>
+        <type>password</type>
+    </field>
     <field>
         <label>UnoEuro</label>
         <type>header</type>
diff --git a/security/acme-client/src/opnsense/mvc/app/library/OPNsense/AcmeClient/LeValidation/DnsUdr.php b/security/acme-client/src/opnsense/mvc/app/library/OPNsense/AcmeClient/LeValidation/DnsUdr.php
new file mode 100644
index 000000000..0fb39e871
--- /dev/null
+++ b/security/acme-client/src/opnsense/mvc/app/library/OPNsense/AcmeClient/LeValidation/DnsUdr.php
@@ -0,0 +1,45 @@
+<?php
+
+/*
+ * Copyright (C) 2022 Jan Winkler
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
+ * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+namespace OPNsense\AcmeClient\LeValidation;
+
+use OPNsense\AcmeClient\LeValidationInterface;
+use OPNsense\Core\Config;
+
+/**
+ * udr API
+ * @package OPNsense\AcmeClient
+ */
+class DnsUdr extends Base implements LeValidationInterface
+{
+    public function prepare()
+    {
+        $this->acme_env['UDR_USER'] = (string)$this->config->dns_udr_user;
+        $this->acme_env['UDR_PASS'] = (string)$this->config->dns_udr_password;
+    }
+}
diff --git a/security/acme-client/src/opnsense/mvc/app/models/OPNsense/AcmeClient/AcmeClient.xml b/security/acme-client/src/opnsense/mvc/app/models/OPNsense/AcmeClient/AcmeClient.xml
index 9ed293b83..8796d1a5e 100644
--- a/security/acme-client/src/opnsense/mvc/app/models/OPNsense/AcmeClient/AcmeClient.xml
+++ b/security/acme-client/src/opnsense/mvc/app/models/OPNsense/AcmeClient/AcmeClient.xml
@@ -492,6 +492,7 @@
                         <dns_servercow>Servercow</dns_servercow>
                         <dns_simply>Simply.com</dns_simply>
                         <dns_transip>Transip</dns_transip>
+                        <dns_udr>united-domains Reselling</dns_udr>
                         <dns_unoeuro>UnoEuro</dns_unoeuro>
                         <dns_variomedia>Variomedia.de</dns_variomedia>
                         <dns_vscale>Vscale</dns_vscale>
@@ -964,6 +965,12 @@
                 <dns_transip_key type="TextField">
                     <Required>N</Required>
                 </dns_transip_key>
+                <dns_udr_user type="TextField">
+                    <Required>N</Required>
+                </dns_udr_user>
+                <dns_udr_password type="TextField">
+                    <Required>N</Required>
+                </dns_udr_password>
                 <dns_uno_key type="TextField">
                     <Required>N</Required>
                 </dns_uno_key>