ns2.nic.DO has no CNAME records.
Question and response
Question
dig ns2.nic.DO. NS
Answer
The response has no answer records.
Authority
nic.DO. 41 SOA ns.nic.DO. hostmaster.nic.DO. 2025070301 3600 900 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0