dns1.next-data.net has no CNAME records.
Question and response
Question
dig dns1.next-data.net. NS
Answer
The response has no answer records.
Authority
next-data.net. 114 SOA dns1.next-data.net. hostmaster.next-data.net. 2025121104 14400 3600 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0