diff --git a/das/config.php.dist b/das/config.php.dist
index 976462f..8c09e61 100644
--- a/das/config.php.dist
+++ b/das/config.php.dist
@@ -7,6 +7,8 @@ return [
     'db_database' => 'registry',
     'db_username' => 'your_username',
     'db_password' => 'your_password',
+    'das_ipv4' => '0.0.0.0',
+    'das_ipv6' => '::', // Set to false if no IPv6 support
     'rately' => false,
     'limit' => 1000,
     'period' => 60,
diff --git a/das/start_das.php b/das/start_das.php
index 477ce38..df08a1b 100644
--- a/das/start_das.php
+++ b/das/start_das.php
@@ -25,7 +25,10 @@ $pool = new Swoole\Database\PDOPool(
 );
 
 // Create a Swoole TCP server
-$server = new Server('0.0.0.0', 1043);
+$server = new Server($c['das_ipv4'], 1043);
+if ($c['das_ipv6'] !== false) {
+    $server->addListener($c['das_ipv6'], 1043, SWOOLE_SOCK_TCP6);
+}
 $server->set([
     'daemonize' => false,
     'log_file' => '/var/log/namingo/das_application.log',
diff --git a/epp/config.php.dist b/epp/config.php.dist
index 2b4a50c..533c4b6 100644
--- a/epp/config.php.dist
+++ b/epp/config.php.dist
@@ -8,6 +8,7 @@ return [
     'db_username' => 'your_username',
     'db_password' => 'your_password',
     'epp_host' => '0.0.0.0',
+    'epp_host_ipv6' => '::', // Set to false if no IPv6 support
     'epp_port' => 700,
     'epp_pid' => '/var/run/epp.pid',
     'epp_greeting' => 'Namingo EPP Server 1.0',
diff --git a/epp/start_epp.php b/epp/start_epp.php
index 5a8dc6b..dfaec32 100644
--- a/epp/start_epp.php
+++ b/epp/start_epp.php
@@ -45,6 +45,9 @@ $pool = new Swoole\Database\PDOPool(
 
 Swoole\Runtime::enableCoroutine();
 $server = new Server($c['epp_host'], $c['epp_port']);
+if ($c['epp_host_ipv6'] !== false) {
+    $server->addListener($c['epp_host_ipv6'], $c['epp_port'], SWOOLE_SOCK_TCP6);
+}
 $server->set([
     'enable_coroutine' => true,
     'log_file' => '/var/log/namingo/epp_application.log',
diff --git a/whois/port43/config.php.dist b/whois/port43/config.php.dist
index cf0d3cd..c6fe73a 100644
--- a/whois/port43/config.php.dist
+++ b/whois/port43/config.php.dist
@@ -7,6 +7,8 @@ return [
     'db_database' => 'registry',
     'db_username' => 'your_username',
     'db_password' => 'your_password',
+    'whois_ipv4' => '0.0.0.0',
+    'whois_ipv6' => '::', // Set to false if no IPv6 support
     'privacy' => false,
     'minimum_data' => false,
     'roid' => 'XX',
diff --git a/whois/port43/start_whois.php b/whois/port43/start_whois.php
index 922e9f5..075a09b 100644
--- a/whois/port43/start_whois.php
+++ b/whois/port43/start_whois.php
@@ -25,7 +25,10 @@ $pool = new Swoole\Database\PDOPool(
 );
 
 // Create a Swoole TCP server
-$server = new Server('0.0.0.0', 43);
+$server = new Server($c['whois_ipv4'], 43);
+if ($c['whois_ipv6'] !== false) {
+    $server->addListener($c['whois_ipv6'], 43, SWOOLE_SOCK_TCP6);
+}
 $server->set([
     'daemonize' => false,
     'log_file' => '/var/log/namingo/whois_application.log',