The name servers for your .DE domain name will need to abide by a certain criteria, which the below article will outline.
In order to change the name servers on your .DE domain name the new name servers must meet the following requirements:
- You must have two authoritative name servers
- You can verify if your name servers are authoritative by visiting https://www.denic.de/en/service/tools/nast/ and entering the domain name and its name servers to receive a reply.
- If the answer at ZoneCheck lists a non-authoritative answer at the top of the name server list, your name servers are not authoritative.
- The name servers in the domain name’s zone file must match the name servers you are trying to use, or your name servers would considered non-authoritative.
- Each name server must be on a separate class-C network.
- The first three octets cannot be the same. For example, 18.104.22.168 and 22.214.171.124 are valid. 126.96.36.199 and 188.8.131.52 are not valid.
- You must have a Start of Authority (SOA) refresh value between 10000 and 86400 seconds.
- You must have a retry value between 1800 and 28800 seconds.
- You must have a Time to Live (TTL) value between 180 and 345600.
- You must specify a Mail Exchanger (MX) record that resolves to a valid mail server for the life of the domain name registration, not just for the registration itself
- Serial numbers for all name server zones for the domain name must match.
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 re-run 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