barracuda.tnexchange.com has no CNAME records.
Question and response
Question
dig barracuda.tnexchange.com. NS
Answer
The response has no answer records.
Authority
tnexchange.com. 3068 SOA ns1.usmhosting.com. managers.tntechnologies.net. 2026021301 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0