diff --git a/lib/Froxlor/Api/Commands/Domains.php b/lib/Froxlor/Api/Commands/Domains.php
index ab81efd5..1b4bf6f2 100644
--- a/lib/Froxlor/Api/Commands/Domains.php
+++ b/lib/Froxlor/Api/Commands/Domains.php
@@ -110,7 +110,7 @@ class Domains extends ApiCommand implements ResourceEntity
 	 *
 	 * @param number $domain_id
 	 * @param bool $ssl_only
-	 *            optional, return only ssl enabled ip's, default false
+	 *            optional, return only ssl enabled ips, default false
 	 * @return array
 	 */
 	private function getIpsForDomain($domain_id = 0, $ssl_only = false)
@@ -207,7 +207,7 @@ class Domains extends ApiCommand implements ResourceEntity
 	 * @param string $ssl_specialsettings
 	 *            optional, custom webserver vhost-content which is added to the generated ssl-vhost, default empty
 	 * @param bool $include_specialsettings
-	 *            optional, whether or not to include non-ssl specialsettings in the generated ssl-vhost, default false
+	 *            optional, whether to include non-ssl specialsettings in the generated ssl-vhost, default false
 	 * @param bool $notryfiles
 	 *            optional, [nginx only] do not generate the default try-files directive, default 0 (false)
 	 * @param bool $writeaccesslog
@@ -216,7 +216,7 @@ class Domains extends ApiCommand implements ResourceEntity
 	 *            optional, Enable writing an error-log file for this domain, default 1 (true)
 	 * @param string $documentroot
 	 *            optional, specify homedir of domain by specifying a directory (relative to customer-docroot), be
-	 *            aware, if path starts with / it it considered a full path, not relative to customer-docroot. Also
+	 *            aware, if path starts with / it is considered a full path, not relative to customer-docroot. Also
 	 *            specifying a URL is possible here (redirect), default empty (autogenerated)
 	 * @param bool $phpenabled
 	 *            optional, whether php is enabled for this domain, default 0 (false)
@@ -241,7 +241,7 @@ class Domains extends ApiCommand implements ResourceEntity
 	 *            optional, do NOT set the systems default ssl ip addresses if none are given via $ssl_ipandport
 	 *            parameter
 	 * @param bool $sslenabled
-	 *            optional, whether or not SSL is enabled for this domain, regardless of the assigned ssl-ips, default
+	 *            optional, whether SSL is enabled for this domain, regardless of the assigned ssl-ips, default
 	 *            1 (true)
 	 * @param bool $http2
 	 *            optional, whether to enable http/2 for this domain (requires to be enabled in the settings), default
@@ -249,9 +249,9 @@ class Domains extends ApiCommand implements ResourceEntity
 	 * @param int $hsts_maxage
 	 *            optional max-age value for HSTS header
 	 * @param bool $hsts_sub
-	 *            optional whether or not to add subdomains to the HSTS header
+	 *            optional whether to add subdomains to the HSTS header
 	 * @param bool $hsts_preload
-	 *            optional whether or not to preload HSTS header value
+	 *            optional whether to preload HSTS header value
 	 * @param bool $ocsp_stapling
 	 *            optional whether to enable ocsp-stapling for this domain. default 0 (false), requires SSL
 	 * @param bool $honorcipherorder
@@ -260,7 +260,7 @@ class Domains extends ApiCommand implements ResourceEntity
 	 *            optional whether to enable or disable TLS sessiontickets (RFC 5077) for this domain. default 1
 	 *            (true), requires SSL
 	 * @param bool $override_tls
-	 *            optional whether or not to override system-tls settings like protocol, ssl-ciphers and if applicable
+	 *            optional whether to override system-tls settings like protocol, ssl-ciphers and if applicable
 	 *            tls-1.3 ciphers, requires change_serversettings flag for the admin, default false
 	 * @param array $ssl_protocols
 	 *            optional list of allowed/used ssl/tls protocols, see system.ssl_protocols setting, only used/required
@@ -1076,7 +1076,7 @@ class Domains extends ApiCommand implements ResourceEntity
 	 * @param string $ssl_specialsettings
 	 *            optional, custom webserver vhost-content which is added to the generated ssl-vhost, default empty
 	 * @param bool $include_specialsettings
-	 *            optional, whether or not to include non-ssl specialsettings in the generated ssl-vhost, default false
+	 *            optional, whether to include non-ssl specialsettings in the generated ssl-vhost, default false
 	 * @param bool $specialsettingsforsubdomains
 	 *            optional, whether to apply specialsettings to all subdomains of this domain, default is read from
 	 *            setting system.apply_specialsettings_default
@@ -1088,7 +1088,7 @@ class Domains extends ApiCommand implements ResourceEntity
 	 *            optional, Enable writing an error-log file for this domain, default 1 (true)
 	 * @param string $documentroot
 	 *            optional, specify homedir of domain by specifying a directory (relative to customer-docroot), be
-	 *            aware, if path starts with / it it considered a full path, not relative to customer-docroot. Also
+	 *            aware, if path starts with / it is considered a full path, not relative to customer-docroot. Also
 	 *            specifying a URL is possible here (redirect), default empty (autogenerated)
 	 * @param bool $phpenabled
 	 *            optional, whether php is enabled for this domain, default 0 (false)
@@ -1117,7 +1117,7 @@ class Domains extends ApiCommand implements ResourceEntity
 	 *            optional, if set to true and no $ssl_ipandport value is given, the ip's get removed, otherwise, the
 	 *            currently set value is used, default false
 	 * @param bool $sslenabled
-	 *            optional, whether or not SSL is enabled for this domain, regardless of the assigned ssl-ips, default
+	 *            optional, whether SSL is enabled for this domain, regardless of the assigned ssl-ips, default
 	 *            1 (true)
 	 * @param bool $http2
 	 *            optional, whether to enable http/2 for this domain (requires to be enabled in the settings), default
@@ -1125,9 +1125,9 @@ class Domains extends ApiCommand implements ResourceEntity
 	 * @param int $hsts_maxage
 	 *            optional max-age value for HSTS header
 	 * @param bool $hsts_sub
-	 *            optional whether or not to add subdomains to the HSTS header
+	 *            optional whether to add subdomains to the HSTS header
 	 * @param bool $hsts_preload
-	 *            optional whether or not to preload HSTS header value
+	 *            optional whether to preload HSTS header value
 	 * @param bool $ocsp_stapling
 	 *            optional whether to enable ocsp-stapling for this domain. default 0 (false), requires SSL
 	 * @param bool $honorcipherorder
@@ -2187,4 +2187,114 @@ class Domains extends ApiCommand implements ResourceEntity
 		}
 		throw new Exception("Not allowed to execute given command.", 403);
 	}
+
+	/**
+	 * duplicate domain entry by either id or domainname. All parameters from Domains.add() can be used
+	 * to overwrite source entity values if necessary.
+	 *
+	 * @param int $id
+	 *            optional, the domain-id
+	 * @param string $domainname
+	 *            optional, the domainname
+	 * @param string $domain
+	 *            required, name of the new domain to be added
+	 *
+	 * @access admin
+	 * @return string json-encoded array
+	 * @throws Exception
+	 */
+	public function duplicate()
+	{
+		if ($this->isAdmin()) {
+			// parameters
+			$id = $this->getParam('id', true, 0);
+			$dn_optional = $id > 0;
+			$domainname = $this->getParam('domainname', $dn_optional, '');
+			$p_domain = $this->getParam('domain');
+
+			// get requested domain
+			$result = $this->apiCall('Domains.get', [
+				'id' => $id,
+				'domainname' => $domainname,
+			]);
+
+			// clear some defaults
+			unset($result['domain_ace']);
+			unset($result['adminid']);
+			unset($result['documentroot']);
+			unset($result['registration_date']);
+			unset($result['termination_date']);
+			unset($result['zonefile']);
+			// clear auto-generated values
+			unset($result['bindserial']);
+			unset($result['dkim_privkey']);
+			unset($result['dkim_pubkey']);
+			// clear api-call generated fields
+			unset($result['domain_hascert']);
+
+			// set correct ip/port information
+			$domain_ips = $result['ipsandports'];
+			unset($result['ipsandports']);
+			$result['ipandport'] = [];
+			$result['ssl_ipandport'] = [];
+			foreach ($domain_ips as $dip) {
+				if ($dip['ssl'] == 1) {
+					$result['ssl_ipandport'][] = $dip['id'];
+				} else {
+					$result['ipandport'][] = $dip['id'];
+				}
+			}
+
+			// check whether we are changing the customer/owner
+			if ($this->getParam('customerid', true, 0) == 0 && $this->getParam('loginname', true, '') == '') {
+				$customerid = $result['customerid'];
+			} else {
+				$customer = $this->getCustomerData();
+				$customerid = $customer['customerid'];
+			}
+
+			// check for alias-domain and whether it belongs to the target user
+			if (!empty($result['aliasdomain']) && $customerid == $result['customerid']) {
+				// duplicate alias entry
+				$result['alias'] = $result['aliasdomain'];
+			}
+			unset($result['aliasdomain']);
+
+			// validate possible fpm configs and whether the customer is allowed to use them
+			if ($customerid != $result['customerid']) {
+				$allowed_phpconfigs = json_decode($customer['allowed_phpconfigs'] ?? '[]', true);
+				if (empty($allowed_phpconfigs)) {
+					// system defaults
+					unset($result['phpsettingid']);
+				} elseif (!in_array($result['phpsettingid'], $allowed_phpconfigs)) {
+					// use the first customer allowed config
+					$result['phpsettingid'] = array_shift($allowed_phpconfigs);
+				}
+			}
+
+			// translate serveralias values
+			$result['selectserveralias'] = 2;
+			if ((int)$result['wwwserveralias'] == 1) {
+				$result['selectserveralias'] = 1;
+			} elseif ((int)$result['iswildcarddomain'] == 1) {
+				$result['selectserveralias'] = 0;
+			}
+			unset($result['wwwserveralias']);
+			unset($result['iswildcarddomain']);
+
+			$additional_params = $this->getParamList();
+			// unset unneeded params from this call
+			unset($additional_params['id']);
+			unset($additional_params['domainname']);
+			unset($additional_params['domain']);
+
+			// set new values and merge with optional add() parameters
+			$new_domain = array_merge($result, $additional_params);
+			$new_domain['domain'] = $p_domain;
+
+			$result_new = $this->apiCall('Domains.add', $new_domain);
+			return $this->response($result_new);
+		}
+		throw new Exception("Not allowed to execute given command.", 403);
+	}
 }
diff --git a/tests/Domains/DomainsTest.php b/tests/Domains/DomainsTest.php
index 716f18e6..48a771f2 100644
--- a/tests/Domains/DomainsTest.php
+++ b/tests/Domains/DomainsTest.php
@@ -385,6 +385,26 @@ class DomainsTest extends TestCase
 	 *
 	 * @depends testAdminDomainsMove
 	 */
+	public function testAdminDomainsDuplicate()
+	{
+		global $admin_userdata;
+		$data = [
+			'domainname' => 'test.local',
+			'domain' => 'test.duplicate.local',
+			'description' => 'duplicated domain'
+		];
+		$json_result = Domains::getLocal($admin_userdata, $data)->duplicate();
+		$result = json_decode($json_result, true)['data'];
+		$this->assertEquals('/var/customers/webs/test3/test.duplicate.local/', $result['documentroot']);
+		$this->assertEquals(1, $result['email_only']);
+		$this->assertEquals('test.duplicate.local', $result['domain']);
+		$this->assertEquals('duplicated domain', $result['description']);
+	}
+
+	/**
+	 *
+	 * @depends testAdminDomainsDuplicate
+	 */
 	public function testAdminDomainsDelete()
 	{
 		global $admin_userdata;