The registration at GoIP.de is simple and free of charge. Just fill in the form and after a few minutes you will receive an email containing the activation link for your new account.
Your email will be used as login and is like the password case sensitve.
The password should be between 8 and 64 characters as a combination of lower-, uppercase letters and numbers.
I assume no liability for this service. This means I can not guarantee in any way for availability, compatibility or consistency of this service.
Otherwise, I would ask you to comply with German law. No trademark infringement or illegal content. User accounts with obvious violations will be locked or deleted without notice. The same applies to counterfeit user account informations (like fake names or invalid email addresses).
There is no support for accounts with fake names or email addresses (e.g. trashmail).
Every account will be locked after 200 days of inactivity.
Please note, that dyndns services work with ip addresses. You, your router or software will submit your ip address to GoIP where it it will be saved and published with your subdomain. Also have a look at the GoIP privacy statement page.