It appears from the forum that it is not possible anymore to apply for a new free account. But on page http://dyn.com/legal/account-ownership-and-recovery-policy/ there is a reference that a new account can be created via https://account.dyn.com/entrance/ Just give it a try.
Starting now, if you would like to maintain your free Dyn account, you must log into your account once a month. Failure to do so will result in expiration and loss of your hostname. This activity helps us eliminate hostnames that are no longer needed and/or dormant. Note that using an update client will no longer suffice for this monthly login.
Dyn users should have a look at the following (german): http://www.ip-phone-forum.de/showthread.php?t=260356 and OpenDD
Creating a Feetz Image with Inadyn¶
Make sure the following is selected:
[*] Show advanced options
Package selection ---> Testing ---> [*] Inadyn-mt 02.24.36
Setup in Freetz web-interface¶
If you have enabled the syslog you can verify the syslog messages. E.g. via a telnet or ssh connection you can using the following command:
Or via the Freetz web interface: Status > Syslog You can filter on INADYN to show only Inadyn related messages. You will see that the every 10 minutes by default the IP address is verified for changes. Only if the IP address changed, your account at your DNS provider is updates with this new IP address.