Testing .DE domain name servers before making a change mandatory to check whether the new nameservers meet the technical requirements of DENIC (German Central Registry for .DE Domains).
If the nameservers do not pass DENIC’s check, the nameserver change will fail and the domain cannot be redirected to the new nameservers.
Why is testing necessary?
DENIC applies stricter technical requirements to .DE domains than to many other top-level domains.
The purpose of testing is to ensure:
- DNS reliability
- correct and fast response to queries
- sufficient number and independence of name servers
Therefore, name server changes are only allowed if they meet all requirements.
How does the test work?
- Open https://nast.denic.de/
- Enter the domain name and new nameservers (e.g. ns1.example.com, ns2.example.com)
- Run the test and wait for the results
Meaning of the test results
Green (OK)
- Name servers meet DENIC requirements
→ Name server change can be successfully performed here
Error or warning (Error / Warning)
- Name servers do not meet requirements
→ Name server change fails