ns6.umantis.com has no CNAME records.
Question and response
Question
dig ns6.umantis.com. NS
Answer
The response has no answer records.
Authority
umantis.com. 947 SOA ns1.umantis.com. hostmaster.umantis.com. 2026022406 7200 1800 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0