iOS App iOS App

The Dynu iOS App allows iOS users to manage their Dynu account with an easy-to-use mobile application. The IP Update Client utility in the app detects any changes to your system's IP Address and reports it to Dynu DNS servers so that your domain name keeps mapped to the dynamic IP address detected by the App. This application supports IPv4 and IPv6 updates as well as location and is an essential part of the dynamic DNS service.

Listing Item   Install

You can browse to the Dynu iOS App link in the browser and open it in the App Store to have it installed on your mobile device. You may also directly search for 'Dynu' in the App Store and tap the Install button.

Dynu IP Update Client iOS App Store
Dynu IP Update Client iOS App Store


Listing Item   Setup

Once installed, you will see a login page where you can enter your Dynu account username and password to log in. Once logged in, you will be presented with a menu with options such as Dynamic DNS Service, IP Update Client etc. You can go into the IP Update Client section to configure the IP updates.

Dynu IP Update Client iOS
Dynu IP Update Client iOS


The IP update function is disabled by default because this application does not only allow you to perform IP updates, but also gives you the option to manage your free dynamic DNS hostnames on your mobile device. If you want to use this application for IP updates, You need to configure the utility as shown:

Activate IP update  This field has to be enabled for the IP update function to run.

Update IPv4 Address  Enable this option if you want your IPv4 address to be updated.

Update IPv6 Address  Enable this option if you want your IPv6 address to be updated.

IP Update Interval  Choose how often you want the IP updates to be performed. iOS does not schedule background work more often than every 15 minutes, so 15 minutes is the shortest interval which can be selected.

IP Update Group  Use 'IP Update Group' parameter if you want to update IP address for one or a collection of hostnames including those created using aliases in different locations. You may set up group names for your hostnames in the control panel. Make sure that you leave the 'IP Update Group' field empty if you did not assign your hostnames to a location/group in the control panel.

Once you fill out all the fields, clicking the Save button will save your settings. The app then checks your IP address at the interval you have chosen and updates your hostnames whenever the IP address changes, including while the app is closed. You may also update the IP address straight away at any time by clicking on the Update IP Now button.

Dynu IP Update Client iOS


Listing Item   Background App Refresh

iOS limits what an application is allowed to do once it is no longer on the screen. Every application relies on the system-wide 'Background App Refresh' setting to determine whether it is allowed to run scheduled work while closed. For most applications this is harmless, but for the IP Update Client it means that scheduled IP updates can be delayed or stopped altogether while the app is closed, leaving your hostname pointing at an IP address which is no longer current.

To make sure that IP updates keep running while the app is closed, turn on Background App Refresh for the Dynu app. Only you can change this setting as an application is not permitted to change it on its own.

Background App Refresh  This has to be turned on for the Dynu app. If it is turned off, the app is not allowed to run in the background at all and IP updates stop completely while the app is closed.

Wi-Fi & Cellular Data  Under Settings → General → Background App Refresh, make sure the system-wide setting is set to 'Wi-Fi' or 'Wi-Fi & Cellular Data' rather than 'Off', otherwise no app, including Dynu, will be allowed to refresh in the background regardless of its individual setting.

You may reach this setting on your device as shown:

  • Open the iOS Settings app.
  • Go to General → Background App Refresh and confirm it is set to Wi-Fi or Wi-Fi & Cellular Data.
  • Go back to Settings and scroll down to select Dynu.
  • Turn on Background App Refresh for the Dynu app.

Dynu IP Update Client iOS Background App Refresh Setting
Dynu IP Update Client iOS Turn On Background App Refresh


Dynu IP Update Client iOS Background App Refresh Off
Dynu IP Update Client iOS Background App Refresh On


The app checks this setting for you. When you activate IP updates, if Background App Refresh is off, the app asks you to turn it on and offers an open settings link which takes you directly to the 'Background App Refresh' page for the Dynu app. A message is also displayed on the IP Update screen, as shown in the screenshot above, along with the same 'open settings' link. The message stays on the screen for as long as Background App Refresh is off, so the setting remains reachable at any time.

Listing Item  Even when Background App Refresh is turned on, iOS decides when an application is woken up. An update may therefore run later than the interval you have chosen. The IP update interval is a minimum and not an exact schedule.

Listing Item  Low Power Mode overrides this setting while it is switched on and will pause background IP updates until it is switched off.

Listing Item  If the system-wide 'Background App Refresh' setting under Settings → General is set to 'Off', the per-app toggle for Dynu will not be available and IP updates will not run in the background regardless of the app's own setting.

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