ns.ptsi.net has no CNAME records.
Question and response
Question
dig ns.ptsi.net. NS
Answer
The response has no answer records.
Authority
ptsi.net. 12870 SOA ns.ptsi.net. noc.ptci.net. 2026021982 10800 3600 604800 38400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0