diff --git a/changelogs/fragments/11231-perc-format.yml b/changelogs/fragments/11231-perc-format.yml
new file mode 100644
index 0000000000..2d48156fab
--- /dev/null
+++ b/changelogs/fragments/11231-perc-format.yml
@@ -0,0 +1,3 @@
+minor_changes:
+  - oneandone_server - replace ``%`` templating with f-strings or ``format()`` (https://github.com/ansible-collections/community.general/pull/11231).
+  - packet_device - replace ``%`` templating with f-strings or ``format()`` (https://github.com/ansible-collections/community.general/pull/11231).
diff --git a/plugins/modules/oneandone_server.py b/plugins/modules/oneandone_server.py
index 0d54997f35..e3c37570ff 100644
--- a/plugins/modules/oneandone_server.py
+++ b/plugins/modules/oneandone_server.py
@@ -553,7 +553,7 @@ def _auto_increment_hostname(count, hostname):
     name-02, name-03, and so forth.
     """
     if "%" not in hostname:
-        hostname = "%s-%%01d" % hostname  # noqa
+        hostname = f"{hostname}-%01d"
 
     return [hostname % i for i in range(1, count + 1)]
 
diff --git a/plugins/modules/packet_device.py b/plugins/modules/packet_device.py
index eeb3f48fc2..0a73833163 100644
--- a/plugins/modules/packet_device.py
+++ b/plugins/modules/packet_device.py
@@ -423,8 +423,7 @@ def get_hostname_list(module):
         if re.search(r"%\d{0,2}d", hostname_spec):
             hostnames = [hostname_spec % i for i in count_range]
         elif count > 1:
-            hostname_spec = "%s%%02d" % hostname_spec  # noqa
-            hostnames = [hostname_spec % i for i in count_range]
+            hostnames = [f"{hostname_spec}{i:02}" for i in count_range]
 
     for hn in hostnames:
         if not is_valid_hostname(hn):
@@ -500,9 +499,8 @@ def wait_for_devices_active(module, packet_conn, watched_devices):
         if all(d.state == "active" for d in refreshed):
             return refreshed
         time.sleep(5)
-    raise Exception(
-        'Waiting for state "active" timed out for devices: %s' % [d.hostname for d in refreshed if d.state != "active"]
-    )
+    timed_out_devices = [d.hostname for d in refreshed if d.state != "active"]
+    raise Exception(f'Waiting for state "active" timed out for devices: {timed_out_devices}')
 
 
 def wait_for_public_IPv(module, packet_conn, created_devices):