diff --git a/README.md b/README.md
index ddaffdd..926dce3 100644
--- a/README.md
+++ b/README.md
@@ -35,6 +35,7 @@ Dynamic DNS services currently supported include:
     dnsexit     - See https://dnsexit.com/ for details
     1984.is     - See https://www.1984.is/product/freedns/ for details
     Njal.la     - See https://njal.la/docs/ddns/
+    regfish.de  - See https://www.regfish.de/domains/dyndns/ for details
 
 `ddclient` now supports many cable and DSL broadband routers.
 
diff --git a/ddclient.conf.in b/ddclient.conf.in
index d6bf96c..97b6b59 100644
--- a/ddclient.conf.in
+++ b/ddclient.conf.in
@@ -315,3 +315,10 @@ ssl=yes					# use ssl-support.  Works with
 # password=mypassword
 # quietreply=no|yes
 # my-domain.com
+
+##
+## regfish.de (www.regfish.de/)
+##
+# protocol=regfishde,
+# password=mypassword
+# my-domain.com
diff --git a/ddclient.in b/ddclient.in
index e5d0d0c..86f8602 100755
--- a/ddclient.in
+++ b/ddclient.in
@@ -533,6 +533,10 @@ my %variables = (
         'script'      => setv(T_STRING, 0, 1, '/RemoteUpdate.sv', undef),
         'min-error-interval' => setv(T_DELAY, 0, 0, interval('8m'), 0),
     },
+    'regfishde-common-defaults' => {
+        'server'      => setv(T_FQDNP, 1, 0, 'dyndns.regfish.de', undef),
+        'login'       => setv(T_LOGIN, 0, 0, 0, 'unused', undef),
+    },
 );
 my %services = (
     '1984' => {
@@ -895,6 +899,15 @@ my %services = (
             $variables{'service-common-defaults'},
         ),
     },
+    'regfishde' => {
+        'updateable' => undef,
+        'update'     => \&nic_regfishde_update,
+        'examples'   => \&nic_regfishde_examples,
+        'variables'  => merge(
+            $variables{'regfishde-common-defaults'},
+            $variables{'service-common-defaults'},
+        ),
+    },
 );
 $variables{'merged'} = {
     map({ %{$services{$_}{'variables'}} } keys(%services)),
@@ -7159,6 +7172,67 @@ sub nic_keysystems_update {
   }
 }
 
+######################################################################
+## nic_regfishde_examples
+######################################################################
+sub nic_regfishde_examples {
+    return <<EoEXAMPLE;
+o 'regfishde'
+The 'regfishde' protocol is used by the non-free dynamic DNS service offered by www.regfish.de.
+Check https://www.regfish.de for configuration variables applicable to the 'regfishde' protocol:
+protocol=regfishde
+server=dyndns.regfish.de
+password=service-password          ## password (token) registered with the service
+myhost.mydomain.com                ## the host registered with the service.
+Example ${program}.conf file entries:
+## single host update
+protocol=regfishde
+password=service-password
+myhost.mydomain.com
+EoEXAMPLE
+}
+
+######################################################################
+## nic_regfishde_update
+## response contains "success" on succesfull completion
+######################################################################
+sub nic_regfishde_update {
+ debug("\nnic_regfishde_update -------------------");
+
+ ## update configured host
+ for my $h (@_) {
+   my $ip = delete $config{$h}{'wantip'};
+   my $ipv6 = delete $config{$h}{'wantip'};
+   
+   info("regfish.de setting IP address to %s for %s", $ip, $h);
+
+   my $ipv = ($ip eq ($ipv6 // '')) ? '6' : '4';
+   my $url = "https://$config{$h}{'server'}/?fqdn=$h&ipv$ipv=$ip&forcehost=1&token=$config{$h}{'password'}";
+
+   # Try to get URL
+   my $reply = geturl(proxy => opt('proxy'), url => $url);
+
+   # No response, give error
+   if (!defined($reply) || !$reply) {
+     failed("regfish.de updating %s: failed: %s.", $h, $config{$h}{'server'});
+     last;
+   }
+   last if !header_ok($h, $reply);
+
+   if ($reply =~ /success/)
+   {
+       $config{$h}{'ip'} = $ip;
+       $config{$h}{'mtime'} = $now;
+       $config{$h}{'status'} = 'good';
+       success("updating %s: good: IP address set to %s", $h, $ip);
+    }
+    else
+    {
+       $config{$h}{'status'} = 'failed';
+       failed("updating %s: Server said: '$reply'", $h);
+    }
+  }
+}
 
 # Execute main() if this file is run as a script or run via PAR (https://metacpan.org/pod/PAR),
 # otherwise do nothing. This "modulino" pattern makes it possible to import this file as a module