admin.saas.tuxis.net has no CNAME records.
Question and response
Question
dig admin.saas.tuxis.net. NS
Answer
The response has no answer records.
Authority
saas.tuxis.net. 10749 SOA nsauth1.tuxis.net. hostmaster.tuxis.net. 2026022601 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0