ns2.serverhostgroup.com has no CNAME records.
Question and response
Question
dig ns2.serverhostgroup.com. NS
Answer
The response has no answer records.
Authority
serverhostgroup.com. 906 SOA ns1.serverhostgroup.com. sh.serverhotgroup.com. 2026022201 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0