diff --git a/plinth/modules/dynamicdns/forms.py b/plinth/modules/dynamicdns/forms.py
index 3f2bf1b4c..60454a9df 100644
--- a/plinth/modules/dynamicdns/forms.py
+++ b/plinth/modules/dynamicdns/forms.py
@@ -56,7 +56,7 @@ class ConfigureForm(forms.Form):
                      'router) this URL is used to determine the real '
                      'IP address. The URL should simply return the IP where '
                      'the client comes from (example: '
-                     'http://myip.datasystems24.de).'),
+                     'https://ddns.freedombox.org/ip/).'),
         box_name=gettext_lazy(cfg.box_name))
     help_user = \
         gettext_lazy('The username that was used when the account was '
diff --git a/plinth/modules/dynamicdns/templates/dynamicdns.html b/plinth/modules/dynamicdns/templates/dynamicdns.html
index 1f10b3c5e..0584be5cc 100644
--- a/plinth/modules/dynamicdns/templates/dynamicdns.html
+++ b/plinth/modules/dynamicdns/templates/dynamicdns.html
@@ -11,8 +11,8 @@
   <p>
     {% blocktrans trimmed %}
       If you are looking for a free dynamic DNS account, you may find
-      a free GnuDIP service at <a href='http://gnudip.datasystems24.net'
-      target='_blank'>gnudip.datasystems24.net</a> or you may find
+      a free GnuDIP service at <a href='https://ddns.freedombox.org'
+      target='_blank'>ddns.freedombox.org</a> or you may find
       free update URL based services at
       <a href='http://freedns.afraid.org/' target='_blank'>
       freedns.afraid.org</a>.
diff --git a/plinth/modules/dynamicdns/tests/test_functional.py b/plinth/modules/dynamicdns/tests/test_functional.py
index ceee92ea8..a6064e97a 100644
--- a/plinth/modules/dynamicdns/tests/test_functional.py
+++ b/plinth/modules/dynamicdns/tests/test_functional.py
@@ -6,6 +6,7 @@ Functional, browser based tests for dynamicdns app.
 import time
 
 import pytest
+
 from plinth.tests import functional
 
 pytestmark = [
@@ -55,7 +56,7 @@ def _configure(browser):
     browser.find_by_id('id_dynamicdns_user').fill('tester')
     browser.find_by_id('id_dynamicdns_secret').fill('testingtesting')
     browser.find_by_id('id_dynamicdns_ipurl').fill(
-        'http://myip.datasystems24.de')
+        'https://ddns.freedombox.org/ip/')
     functional.submit(browser)
 
     # After a domain name change, Let's Encrypt will restart the web
@@ -76,7 +77,7 @@ def _has_original_config(browser):
     ipurl = browser.find_by_id('id_dynamicdns_ipurl').value
     if enabled and service_type == 'GnuDIP' and server == 'example.com' \
        and domain == 'freedombox.example.com' and user == 'tester' \
-       and ipurl == 'http://myip.datasystems24.de':
+       and ipurl == 'https://ddns.freedombox.org/ip/':
         return True
     else:
         return False
@@ -93,7 +94,7 @@ def _change_config(browser):
     browser.find_by_id('id_dynamicdns_user').fill('tester2')
     browser.find_by_id('id_dynamicdns_secret').fill('testingtesting2')
     browser.find_by_id('id_dynamicdns_ipurl').fill(
-        'http://myip2.datasystems24.de')
+        'https://ddns2.freedombox.org/ip/')
     functional.submit(browser)
 
     # After a domain name change, Let's Encrypt will restart the web