ns4.aliasdns.net has no CNAME records.
Question and response
Question
dig ns4.aliasdns.net. NS
Answer
The response has no answer records.
Authority
aliasdns.net. 510 SOA pns31.cloudns.net. support.cloudns.net. 2025061103 7200 1800 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0