diff --git a/ddclient.conf.in b/ddclient.conf.in
index 756aec3..c4d5172 100644
--- a/ddclient.conf.in
+++ b/ddclient.conf.in
@@ -301,8 +301,9 @@ ssl=yes					# use ssl-support.  Works with
 # protocol=porkbun
 # apikey=APIKey
 # secretapikey=SecretAPIKey
+# root-domain=example.com
 # host.example.com,host2.sub.example.com
-# on-root-domain=yes example.com,sub.example.com
+# example.com,sub.example.com
 
 ##
 ## ClouDNS (https://www.cloudns.net)
diff --git a/ddclient.in b/ddclient.in
index 5c50d3d..f88a638 100755
--- a/ddclient.in
+++ b/ddclient.in
@@ -869,6 +869,7 @@ my %services = (
         'variables'  => {
             'apikey'         => setv(T_PASSWD, 1, 0, '',         undef),
             'secretapikey'   => setv(T_PASSWD, 1, 0, '',         undef),
+            'root-domain'    => setv(T_OFQDN,  0, 0, '',         undef),
             'on-root-domain' => setv(T_BOOL,   0, 0, 0,          undef),
             'login'          => setv(T_LOGIN,  0, 0, 'unused',   undef),
             'password'       => setv(T_PASSWD, 0, 0, 'unused',   undef),
@@ -7114,9 +7115,11 @@ https://kb.porkbun.com/article/190-getting-started-with-the-porkbun-api
 Available configuration variables:
   * apikey (required): API Key of Porkbun API
   * secretapikey (required): Secret API Key of Porkbun API
+  * root-domain: The root domain of the specified domain name.
   * on-root-domain=yes or no (default: no): Indicates whether the specified domain name (FQDN) is
     an unnamed record (Zone APEX) in a zone.
     It is useful to specify it as a local variable as shown in the example.
+    This configuration value is deprecated, use root-domain instead!
   * usev4, usev6 : These configuration variables can be specified as local variables to override
     the global settings. It is useful to finely control IPv4 or IPv6 as shown in the example.
   * use (deprecated) : This parameter is deprecated but can be overridden like the above parameters.
@@ -7124,13 +7127,19 @@ Available configuration variables:
 Limitations:
   * Multiple same name records (for round robin) are not supported.
     The same IP address is set for all, creating meaningless extra records.
+  * If neither root-domain nor on-root-domain are specified, ${program} will split the given
+    hostname into subdomain and domain on the first dot.
+    For example:
+      * sub.example.com -> Subdomain "sub", root domain "example.com"
+      * sub.foo.example.com -> Subdomain "sub", root domain "foo.example.com"
+    If both root-domain and on-root-domain are specified, root-domain takes precedence.
 
 Example ${program}.conf file entry:
   protocol=porkbun
   apikey=APIKey
   secretapikey=SecretAPIKey
-  host.example.com,host2.sub.example.com
-  on-root-domain=yes example.com,sub.example.com
+  root-domain=example.com
+  example.com,host.example.com,host2.sub.example.com
 
 Additional example to finely control IPv4 or IPv6 :
   # Example 01 : Global enable both IPv4 and IPv6, and update both records.
@@ -7140,6 +7149,7 @@ Additional example to finely control IPv4 or IPv6 :
   protocol=porkbun
   apikey=APIKey
   secretapikey=SecretAPIKey
+  root-domain=example.com
   host.example.com,host2.sub.example.com
 
   # Example 02 : Global enable only IPv4, and update only IPv6 record.
@@ -7148,8 +7158,16 @@ Additional example to finely control IPv4 or IPv6 :
   protocol=porkbun
   apikey=APIKey
   secretapikey=SecretAPIKey
+  root-domain=example.com
   usev6=ifv6, ifv6=enp1s0, usev4=disabled ipv6.example.com
 
+  # Example 03: Update just a root domain
+  protocol=porkbun
+  apikey=APIKey
+  secretapikey=SecretAPIKey
+  root-domain=host.example.com
+  host.example.com
+
 EoEXAMPLE
 }
 
@@ -7160,6 +7178,28 @@ sub nic_porkbun_update {
     debug("\nnic_porkbun_update -------------------");
 
     foreach my $host (@_) {
+        my ($sub_domain, $domain);
+        if ($config{$host}{'root-domain'} ne '') {
+            # Process 'root-domain' option
+            $domain = $config{$host}{'root-domain'};
+            $sub_domain = $host;
+            $sub_domain =~ s/\.$domain//;
+
+            if (!defined($sub_domain)) {
+                error("'root-domain' (%s) is not part of the full domain (%s)!", $domain, $host);
+                next;
+            }
+            warning("%s has both 'root-domain' and 'on-root-domain' defined. The latter is ignored") if $config{$host}{'on-root-domain'};
+        } elsif ($config{$host}{'on-root-domain'}) {
+            # Process legacy 'on-root-domain' option
+            $sub_domain = '';
+            $domain = $host;
+        } else {
+            # Default to the subdomain/domain being split at the first dot
+            ($sub_domain, $domain) = split(/\./, $host, 2);
+        }
+        verbose("subdomain %s, root domain %s", $sub_domain, $domain) if $sub_domain != '';
+
         foreach my $ipv ('ipv4', 'ipv6') {
             my $ip = delete $config{$host}{"want$ipv"};
             if (!$ip) {
@@ -7167,13 +7207,6 @@ sub nic_porkbun_update {
             }
             my $rrset_type = is_ipv6($ip) ? "AAAA" : "A";
 
-            my ($sub_domain, $domain);
-            if ($config{$host}{'on-root-domain'}) {
-                $sub_domain = '';
-                $domain = $host;
-            } else {
-                ($sub_domain, $domain) = split(/\./, $host, 2);
-            }
             info("setting %s address to %s for %s", $ipv, $ip, $host);
             verbose("UPDATE:","updating %s", $host);