ns2011.ispapi.net has no CNAME records.
Question and response
Question
dig ns2011.ispapi.net. NS
Answer
The response has no answer records.
Authority
ispapi.net. 3389 SOA ns1011.ispapi.net. support.ispapi.net. 2025040900 86400 7200 3600000 172800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0