t1.ipfu.de has no CNAME records.
Question and response
Question
dig t1.ipfu.de. NS
Answer
The response has no answer records.
Authority
ipfu.de. 60 SOA dns113.ovh.net. tech.ovh.net. 2026022400 86400 3600 3600000 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0