The nameservers for your .DE domain name will need to abide by a certain set of criteria, which the below article will outline.
In order to change the nameservers on your .DE domain name the new nameservers must meet the following requirements:
Once you have configured your new nameservers you can follow the instructions on changing the nameservers on your domain name.
Important: This command causes a DNS check on the domain. If this check fails, your domain will be deleted (without a refund) four weeks after it was registered. It is important to rerun this command or configure the DNS by other means in order to keep the domain. You can run a DNS check by visiting http://www.denic.de/en/background/nast.html
Watch the content of this article for changes.