ns2.dotplex.de has no CNAME records.
Question and response
Question
dig ns2.dotplex.de. NS
Answer
The response has no answer records.
Authority
dotplex.de. 3527 SOA ns.dotplex.net. support.dotplex.com. 2026022101 86400 10800 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0