c1.uberns.org has no CNAME records.
Question and response
Question
dig c1.uberns.org. NS
Answer
The response has no answer records.
Authority
uberns.org. 5743 SOA a1.uberns.org. itmanager.uberns.com. 2021082301 14400 7200 1209600 14400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0