diff --git a/dns/ddclient/src/opnsense/scripts/ddclient/lib/account/dyndns2.py b/dns/ddclient/src/opnsense/scripts/ddclient/lib/account/dyndns2.py
index e93d0e5abe..e81197751b 100755
--- a/dns/ddclient/src/opnsense/scripts/ddclient/lib/account/dyndns2.py
+++ b/dns/ddclient/src/opnsense/scripts/ddclient/lib/account/dyndns2.py
@@ -40,7 +40,6 @@ class DynDNS2(BaseAccount):
         'dynu': 'api.dynu.com',
         'he-net': 'dyn.dns.he.net',
         'he-net-tunnel': 'ipv4.tunnelbroker.net',
-        'inwx': 'dyndns.inwx.com',
         'loopia': 'dyndns.loopia.se',
         'nsupdatev4': 'ipv4.nsupdate.info',
         'nsupdatev6': 'ipv6.nsupdate.info',
diff --git a/dns/ddclient/src/opnsense/scripts/ddclient/lib/account/inwx.py b/dns/ddclient/src/opnsense/scripts/ddclient/lib/account/inwx.py
new file mode 100644
index 0000000000..6bf4ba8a94
--- /dev/null
+++ b/dns/ddclient/src/opnsense/scripts/ddclient/lib/account/inwx.py
@@ -0,0 +1,123 @@
+"""
+    Copyright (c) 2026 Johannes Nolte <johannes@jonolt.eu>
+    Copyright (c) 2023 Ad Schellevis <ad@opnsense.org>
+    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.
+    ----------------------------------------------------------------------------------------------------
+    INWX DNS updater
+
+    Service specific dyndns2-style account. INWX expects an IPv6 address in the
+    "myipv6" parameter (setting the AAAA record); the dyndns2 legacy "standard"
+    only specifies "myip", so this is kept out of the generic DynDNS2 class.
+    For an IPv4 address the request matches the generic DynDNS2 "/nic/update"
+    output, aside from the no-op "system" / "wildcard" parameters which INWX
+    ignores (its endpoint only reads "hostname", "myip" and "myipv6").
+
+    Record scope is per DynDNS login: a single INWX login bound to both A and
+    AAAA drops whichever family is omitted from an update. For dual-stack, use a
+    separate INWX login per family (each bound to its own record) — the standard
+    OPNsense one-account-per-family model.
+
+    INWX documented update URL:
+        https://dyndns.inwx.com/nic/update?myip=<ipaddr>&myipv6=<ip6addr>
+"""
+import syslog
+import requests
+from requests.auth import HTTPBasicAuth
+from . import BaseAccount
+
+
+class INWX(BaseAccount):
+
+    _services = {
+        'inwx': 'dyndns.inwx.com'
+    }
+
+    def __init__(self, account: dict):
+        super().__init__(account)
+
+    @staticmethod
+    def known_services():
+        return INWX._services.keys()
+
+    @staticmethod
+    def match(account):
+        return account.get('service') in INWX._services
+
+    def execute(self):
+        if super().execute():
+            uri_proto = 'https' if self.settings.get('force_ssl', False) else 'http'
+            url = "%s://%s/nic/update" % (uri_proto, self._services['inwx'])
+
+            # INWX takes an IPv6 address (contains ':') as "myipv6", which sets the
+            # AAAA record; IPv4 goes to "myip" exactly like the generic DynDNS2 class.
+            ip = str(self.current_address)
+            ip_param = 'myipv6' if ':' in ip else 'myip'
+
+            if self.is_verbose:
+                syslog.syslog(
+                    syslog.LOG_NOTICE,
+                    "Account %s sending INWX update using parameter %s" % (self.description, ip_param)
+                )
+
+            req_opts = {
+                'url': url,
+                'params': {
+                    'hostname': self.settings.get('hostnames'),
+                    ip_param: self.current_address
+                },
+                'auth': HTTPBasicAuth(self.settings.get('username'), self.settings.get('password')),
+                'headers': {
+                    'User-Agent': 'OPNsense-dyndns'
+                }
+            }
+            req = requests.get(**req_opts)
+
+            if 200 <= req.status_code < 300:
+                if self.is_verbose:
+                    syslog.syslog(
+                        syslog.LOG_NOTICE,
+                        "Account %s set new ip %s [%s]" % (self.description, self.current_address, req.text.strip())
+                    )
+
+                # Per-login record scope — see module docstring; warn the operator below.
+                syslog.syslog(
+                    syslog.LOG_NOTICE,
+                    "Account %s set %s (%s). For INWX dual-stack use a separate INWX DynDNS "
+                    "login per family (each bound to its own A/AAAA record); a single INWX "
+                    "login covering both records drops the family not sent in a given update" % (
+                        self.description, ip_param, 'AAAA' if ip_param == 'myipv6' else 'A'
+                    )
+                )
+
+                self.update_state(address=self.current_address, status=req.text.split()[0] if req.text else '')
+                return True
+            else:
+                syslog.syslog(
+                    syslog.LOG_ERR,
+                    "Account %s failed to set new ip %s [%d - %s]" % (
+                        self.description, self.current_address, req.status_code, req.text.replace('\n', '')
+                    )
+                )
+
+        return False