DynDNS

Internet / Permit Access / DynDNS

DynDNS (Dynamic DNS) is an internet service that makes it possible for the FRITZ!Box to remain accessible from the internet at all times under a fixed name, although the public IP address of the FRITZ!Box changes each time you dial into the internet.

In order to use this service, you must register with a DynDNS provider. When you register, you arrange for the fixed name (domain name) at which your FRITZ!Box should be accessible from the internet. You also define a username and password.

Every time it dials into the internet, FRITZ!Box transmits its current IP address to the DynDNS provider in the form of an update request. Then the domain name is assigned to the current IP address by the DynDNS provider.

Click on the "Apply" button to save your settings. If you leave the page without saving, all of your changes will be discarded.

Use DynDNS

Enable this option if you would like to use DynDNS (dynamic DNS) for the FRITZ!Box.
Upon activation, the fields listed below are also activated. The information is required for the update request.

Limitations

In some operating modes of the FRITZ!Box DynDNS is not supported:

Operating ModeUse of DynDNS
Wireless repeater If this FRITZ!Box is configured as a wireless repeater, you cannot use DynDNS in this FRITZ!Box. During repeater operation you must set up DynDNS in the FRITZ!Box that is configured as a wireless access point.
IP client When the FRITZ!Box is operated as an IP client on a router in the network, you cannot use DynDNS in this FRITZ!Box. In this case you must set up DynDNS in the router used to establish the internet connection.

DynDNS Provider

Select from this list the DynDNS provider with whom you are registered with the domain name to be used for your FRITZ!Box.
If your DynDNS provider is not included in the list, select the entry "User-defined". Then the additional field "Update URL" will be displayed. For an explanation of this field, see the information below on this Help page.

Register New Domain Name

Once you have selected a DynDNS provider in the "DynDNS Provider" list, click the "Register New Domain Name" button to open a new browser window for the website of the selected DynDNS provider. Then you can register a new domain name with the DynDNS provider.

The "Register New Domain Name" button is only available when you select a provider from the "DynDNS provider" list. The button is not enabled when "User-defined" is selected.

Domain name

Enter in this field the domain name at which your FRITZ!Box is to be accessible from the internet, and which you have arranged for use of with your DynDNS provider. Transmission of the current IP address to the DynDNS provider serves to allocate this domain name to the current IP address.

You must enter the domain name in full length. The domain name is composed of two parts:

  1. the name you selected and arranged with the provider to use, for instance "MyDomain"
  2. the domain name of the provider, for instance "dyndns.org"

The correct entry for this example would look like the following: "MyDomain.dyndns.org".

Username

Enter here the user name with which you are registered with your DynDNS provider. During transmission of the current IP address, the user name is required for registration with the DynDNS provider.

Password

Enter here the password with which you are registered with your DynDNS provider. During transmission of the current IP address, the password is required for registration with the DynDNS provider.

Password confirmation

Repeat the password entry in this field.

Update URL

This field will be displayed only if the "User-defined" entry was selected in the "DynDNS provider" list. The entry in this field indicates how the update request must look for the DynDNS provider. The correct update URL, which must be entered in this field, must be requested from your DynDNS provider, for instance on the provider's website.

  • IPv4, IPv6: If the update request is to be performed for both IPv4 and IPv6, then write both requests in this field separated by a space.
  • Joker: The update URL contains placeholders for all entries required for an update by the DynDNS provider. Which entries are required depends on the provider.

The following table shows all of the entries that may be demanded in an update request. The name of the placeholder is shown for each entry. It is essential that these placeholders be used in the update URL:

  • Pointed brackets: The pointed brackets are an inherent part of the placeholder and absolutely must be given in the update URL.
  • Replace placeholder names: If the update URL supplied by your DynDNS provider uses other placeholder names, these must be replaced by the placeholder names from the above table.
  • Replace placeholders with values: Before transmitting an update request to the DynDNS provider, the placeholders are replaced with your entries in the fields "Domain name", "Username" and "Password". The FRITZ!Box determines the current IP address automatically.

Some DynDNS providers expect the data to be transmitted in Base64-coded format. All data that must be encoded for transmission must be designated as follows in the update URL of the FRITZ!Box:

Examples of the update URL for the IPv4 address:

For the DynDNS providers included in the "DynDNS Provider" list, the update URLs for requesting updates are already preset in the FRITZ!Box.

Example: dyndns.org

The update URL for the provider dyndns.org looks like the following:

The username and password entries are not used in the update URL here.

Example: 2mydns.com

For the provider 2mydns.com, the update URL looks like the following (all in one line and without spaces):

Example: DynAccess von Ambos InterNet-Solutions

For the DynAccess service from the provider Ambos InterNetSolutions, the update URL has the following notation:

Example of the update URL for the IPv4 and the IPv6 address:

Example: dyndns.org

The update URL for the provider dyndns.org looks like the following:

The requests for the two IP addresses are separated by a space.

Example: DynAccess von Ambos InterNet-Solutions

For the DynAccess service from the provider Ambos InterNetSolutions, the update URL has the following notation:

The requests for the two IP addresses are separated by a space.

the data to be encoded are contained here
members.dyndns.org/nic/update?system=dyndns&hostname=&myip=&wildcard=NOCHG