stargate.zerfleddert.de has no CNAME records.
Question and response
Question
dig stargate.zerfleddert.de. NS
Answer
The response has no answer records.
Authority
zerfleddert.de. 1800 SOA eddie.zerfleddert.de. michael.eddie.zerfleddert.de. 2026010101 21600 3600 1209600 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0