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 dynamic DNS 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 user name and password.
Every time it dials into the Internet, FRITZ!Box transmits its current IP address to the dynamic DNS provider in the form of an update request. Then the domain name is assigned to the current IP address by the dynamic DNS provider.
Enable this option if you would like to use the dynamic DNS Internet service for the FRITZ!Box.
Upon activation, the fields listed below are also activated. The information is required for the update request.
Select from this list the dynamic DNS provider with whom you are registered with the domain name to be used for your FRITZ!Box.
If your dynamic DNS 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.
When a dynamic DNS provider has been selected in the "Dynamic DNS provider" list, click the "Register New Domain Name" button to open the Internet site of the selected dynamic DNS provider. Then you can register a new domain name with your dynamic DNS provider.
Note: The "Register New Domain Name" button is only available when you select a provider from the "Dynamic DNS provider" list. The button is not enabled when "User-defined" is selected.
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 dynamic DNS provider. Transmission of the current IP address to the dynamic DNS 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:
The correct entry for this example would look like the following: "MyDomain.dyndns.org".
Enter here the user name with which you are registered with your dynamic DNS provider. During transmission of the current IP address, the user name is required for registration with the dynamic DNS provider.
Enter here the password with which you are registered with your dynamic DNS provider. During transmission of the current IP address, the password is required for registration with the dynamic DNS provider.
Repeat the password entry in this field.
This field will be displayed only if the "User-defined" entry was selected in the "Dynamic DNS provider" list. The entry in this field indicates how the update request must look for the dynamic DNS provider. The correct update URL, which must be entered in this field, must be requested from your dynamic DNS provider, for instance on the provider's Internet site.
The update URL contains jokers for all entries required for an update by the dynamic DNS provider. Which entries are required for the update depends on the provider.
The following table lists all of the entries that may be demanded in an update request.
| Entry | Name of the Joker |
| IP address | <ipaddr> |
| User name | <username> |
| Password | <pass> |
| Domain name | <domain> |
The pointed brackets are part of the joker and absolutely must be entered in the update URL. If the update URL supplied by your dynamic DNS provider uses other joker names, these must be replaced by the joker names from the table above.
Before transmitting an update request to the dynamic DNS provider, the jokers are replaced with your entries in the fields "Domain name", "User name" and "Password". The FRITZ!Box determines the current IP address automatically.
Some dynamic DNS 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:
| <b64>the data to be encoded are contained here</b64> |
Examples
The formulations for update requests from the dynamic DNS providers included in the "Dynamic DNS Provider" list are already preset in the FRITZ!Box.
1. The entry in this field would look as follows for the provider "dyndns.org":
members.dyndns.org/nic/update?system=dyndns&hostname=<domain>&myip=<ipaddr>
The user name and password entries are not used in the update URL.
2. For the provider "2mydns.com", the entry in this field would look as follows (all in one line and without spaces):
dyn.2mydns.com/dyn.asp?username=<username>&password=<pass>&hostname=<domain>
&myip=<ipaddr>
Click the "Apply" button to implement your changes to the settings.