ns2.acens.net has no CNAME records.
Question and response
Question
dig ns2.acens.net. NS
Answer
The response has no answer records.
Authority
acens.net. 6226 SOA ns1.acens.net. hostmaster.acens.net. 1772805525 14400 3600 604800 7200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0