Apex domains cannot have CNAME records.
Question and response
Question
dig ar113.xvserver.com. NS
Answer
ar113.xvserver.com. 5 NS ns2.outdns.net.
ar113.xvserver.com. 5 NS ns1.outdns.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0