ip-63-78-91-144.static.contabo.net has no CNAME records.
Question and response
Question
dig ip-63-78-91-144.static.contabo.net. NS
Answer
The response has no answer records.
Authority
contabo.net. 3390 SOA ns1.contabo.net. hostmaster.contabo.de. 1771722777 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0