core1-clvd.ccrtc.com has no CNAME records.
Question and response
Question
dig core1-clvd.ccrtc.com. NS
Answer
The response has no answer records.
Authority
ccrtc.com. 159 SOA ns1.ccrtc.com. netadmin.ccrtc.com. 2026021300 14400 900 86400 240
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0