csasl.cusae.com has no CNAME records.
Question and response
Question
dig csasl.cusae.com. NS
Answer
The response has no answer records.
Authority
cusae.com. 3849 SOA ns0.cusae.com. hostmaster.cusae.com. 2026022601 43200 7200 2419200 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0