Apex domains cannot have CNAME records.
Question and response
Question
dig uniserve.com. NS
Answer
uniserve.com. 5 NS domains2.uniserve.com.
uniserve.com. 5 NS domains1.uniserve.com.
Authority
The response has no authority records.
Additional
domains1.uniserve.com. 5 A 216.113.192.5
domains2.uniserve.com. 5 A 216.113.192.6
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0