diff --git a/dns/ddclient/src/opnsense/mvc/app/controllers/OPNsense/DynDNS/forms/dialogAccount.xml b/dns/ddclient/src/opnsense/mvc/app/controllers/OPNsense/DynDNS/forms/dialogAccount.xml
index 0ffcf2040..fcc0a2ed1 100644
--- a/dns/ddclient/src/opnsense/mvc/app/controllers/OPNsense/DynDNS/forms/dialogAccount.xml
+++ b/dns/ddclient/src/opnsense/mvc/app/controllers/OPNsense/DynDNS/forms/dialogAccount.xml
@@ -62,7 +62,7 @@
         <id>account.zone</id>
         <label>Zone</label>
         <type>text</type>
-        <style>optional_setting service_aws service_zoneedit1 service_cloudflare service_nsupdate service_gandi service_godaddy service_nfsn service_hetzner service_digitalocean service_dnspodcn</style>
+        <style>optional_setting service_aws service_zoneedit1 service_cloudflare service_nsupdate service_gandi service_godaddy service_nfsn service_hetzner service_digitalocean service_dnspodcn service_transip</style>
         <help>Zone containing the host entry.</help>
     </field>
     <field>
@@ -77,7 +77,7 @@
         <id>account.ttl</id>
         <label>TTL</label>
         <type>text</type>
-        <style>optional_setting service_aws service_netcup service_gandi service_godaddy</style>
+        <style>optional_setting service_aws service_netcup service_gandi service_godaddy service_transip</style>
         <help>Time to Live for the DNS entry</help>
     </field>
     <field>
diff --git a/dns/ddclient/src/opnsense/mvc/app/models/OPNsense/DynDNS/DynDNS.xml b/dns/ddclient/src/opnsense/mvc/app/models/OPNsense/DynDNS/DynDNS.xml
index 75c390ce1..99c7a1b41 100644
--- a/dns/ddclient/src/opnsense/mvc/app/models/OPNsense/DynDNS/DynDNS.xml
+++ b/dns/ddclient/src/opnsense/mvc/app/models/OPNsense/DynDNS/DynDNS.xml
@@ -84,6 +84,7 @@
                         <sitelutions>Sitelutions</sitelutions>
                         <spdyn>spDYN</spdyn>
                         <strato>STRATO</strato>
+                        <transip>TransIP</transip>
                         <woima>Woima</woima>
                         <yandex>Yandex</yandex>
                         <zoneedit1>Zoneedit</zoneedit1>
diff --git a/dns/ddclient/src/opnsense/scripts/ddclient/lib/account/transip.py b/dns/ddclient/src/opnsense/scripts/ddclient/lib/account/transip.py
new file mode 100644
index 000000000..d6bd95188
--- /dev/null
+++ b/dns/ddclient/src/opnsense/scripts/ddclient/lib/account/transip.py
@@ -0,0 +1,226 @@
+"""
+    Copyright (c) 2026 Melvin Groenhoff <melvingroenhoff@gmail.com>
+    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.
+"""
+from . import BaseAccount
+import base64
+import cryptography
+import cryptography.hazmat.primitives.asymmetric.padding
+import cryptography.hazmat.primitives.hashes
+import cryptography.hazmat.primitives.serialization
+import re
+import requests
+import secrets
+import syslog
+import ujson
+
+class TransIP(BaseAccount):
+    _priority = 65535
+
+    _services = ['transip']
+
+    _api_base = "https://api.transip.nl/v6"
+
+    def __init__(self, account: dict):
+        super().__init__(account)
+
+    @staticmethod
+    def known_services():
+        return {'transip': 'TransIP'}
+
+    @staticmethod
+    def match(account):
+        return account.get('service') in TransIP._services
+
+    def execute(self):
+        """Update DNS records according to https://api.transip.nl/rest/docs.html#domains-domains"""
+        if super().execute():
+            domain = self.settings.get('zone')
+
+            access_token = self._get_access_token(self.settings.get('password'))
+            if not access_token:
+                return False
+
+            dns_entries = self._get_dns_entries(access_token, domain)
+
+            # Determine record type based on the IP format
+            record_type = "AAAA" if str(self.current_address).find(':') > -1 else "A"
+
+            # Update DNS records
+            record_names = self.settings.get('hostnames', '').split(',')
+            records_updated = 0
+            for dns_entry in dns_entries:
+                if self.is_verbose:
+                    syslog.syslog(
+                        syslog.LOG_NOTICE,
+                        "Found DNS entry %s (%s)"
+                        % (dns_entry["name"], dns_entry["type"])
+                    )
+
+                for record_name in record_names:
+                    # Only update A/AAAA records
+                    if record_name == dns_entry["name"] and record_type == dns_entry["type"]:
+                        if dns_entry["content"] != str(self.current_address):
+                            content = str(self.current_address)
+                            expire = int(self.settings.get('ttl', 300))
+
+                            if self._update_record(access_token, domain, record_name, record_type, content, expire):
+                                records_updated += 1
+
+                                syslog.syslog(
+                                    syslog.LOG_NOTICE,
+                                    "Account %s updated record %s (%s) from %s to %s and ttl from %s to %s" % (
+                                        self.description,
+                                        record_name,
+                                        record_type,
+                                        dns_entry["content"],
+                                        content,
+                                        dns_entry["expire"],
+                                        expire
+                                    )
+                                )
+
+            if records_updated > 0:
+                self.update_state(address=self.current_address)
+                return True
+
+        return False
+
+    def _normalize_pem(self, data):
+        m = re.match(r'(?ims)(-----BEGIN .+-----)(.+)(-----END .+-----)', re.sub(r'[\r\n]', '', data.strip()))
+        if not m:
+            return None
+
+        groups = list(m.groups())
+        groups[1] = groups[1].replace(' ', '')
+        return "\n".join(groups)
+
+    def _get_access_token(self, private_key):
+        """Retrieve auth token according to https://api.transip.nl/rest/docs.html#header-authentication"""
+
+        private_key = cryptography.hazmat.primitives.serialization.load_pem_private_key(
+            self._normalize_pem(private_key).encode(),
+            password=None
+        )
+
+        data = ujson.dumps({
+            "login": self.settings.get('username'),
+            "nonce": secrets.token_hex(16),
+            "read_only": False,
+            "expiration_time": "30 seconds",
+            "label": "OPNsense-dyndns",
+            "global_key": True # Bypass IP whitelist because that's the whole point of dynamic dns
+        })
+
+        signature = private_key.sign(
+            data.encode(),
+            cryptography.hazmat.primitives.asymmetric.padding.PKCS1v15(),
+            cryptography.hazmat.primitives.hashes.SHA512()
+        )
+
+        headers = {
+            "Content-Type": "application/json",
+            "Signature": base64.b64encode(signature)
+        }
+
+        response = requests.post(f"{self._api_base}/auth", data=data, headers=headers)
+
+        if 200 < response.status_code >= 300:
+            syslog.syslog(
+                syslog.LOG_ERR,
+                "Account %s error getting auth token: HTTP %d - %s" % (
+                    self.description, response.status_code, response.text
+                )
+            )
+            return None
+
+        try:
+            payload = response.json()
+        except requests.exceptions.JSONDecodeError:
+            syslog.syslog(
+                syslog.LOG_ERR,
+                "Account %s error parsing JSON response: %s" % (self.description, response.text)
+            )
+            return None
+
+        return payload.get("token")
+
+    def _get_dns_entries(self, access_token, domain):
+        url = f"{self._api_base}/domains/{domain}/dns"
+
+        headers = {
+            "Authorization": f"Bearer {access_token}"
+        }
+
+        response = requests.get(url, headers=headers)
+
+        if 200 < response.status_code >= 300:
+            syslog.syslog(
+                syslog.LOG_ERR,
+                "Account %s error fetching dns entries: HTTP %d - %s" % (
+                    self.description, response.status_code, response.text
+                )
+            )
+            return None
+
+        try:
+            payload = response.json()
+        except requests.exceptions.JSONDecodeError:
+            syslog.syslog(
+                syslog.LOG_ERR,
+                "Account %s error parsing JSON response: %s" % (self.description, response.text)
+            )
+            return None
+
+        return payload.get("dnsEntries")
+
+    def _update_record(self, access_token, domain, record_name, record_type, content, expire):
+        url = f"{self._api_base}/domains/{domain}/dns"
+
+        data = {
+            "dnsEntry": {
+                "name": record_name,
+                "type": record_type,
+                "content": content,
+                "expire": expire
+            }
+        }
+
+        headers = {
+            "Authorization": f"Bearer {access_token}",
+            "Content-Type": "application/json"
+        }
+
+        response = requests.patch(url, json=data, headers=headers)
+
+        if 200 < response.status_code >= 300:
+            syslog.syslog(
+                syslog.LOG_ERR,
+                "Account %s error updating dns entry: HTTP %d - %s" % (
+                    self.description, response.status_code, response.text
+                )
+            )
+            return False
+
+        return True
diff --git a/dns/ddclient/src/opnsense/service/templates/OPNsense/ddclient/ddclient.conf b/dns/ddclient/src/opnsense/service/templates/OPNsense/ddclient/ddclient.conf
index d82eb19d9..da9830d0e 100644
--- a/dns/ddclient/src/opnsense/service/templates/OPNsense/ddclient/ddclient.conf
+++ b/dns/ddclient/src/opnsense/service/templates/OPNsense/ddclient/ddclient.conf
@@ -44,7 +44,7 @@ protocol={{account.service}}, \
 dynurl=https://ipv4.cloudns.net/api/dynamicURL/?q={{account.password}}, \
 {%      elif account.service == 'hosting1984' %}
 protocol=1984, \
-{%      elif account.service in ['godaddy', 'gandi'] %}
+{%      elif account.service in ['godaddy', 'gandi', 'transip'] %}
 protocol={{account.service}}, \
 zone={{account.zone}}, \
 ttl={{account.ttl}}, \