Apex domains cannot have CNAME records.
Question and response
Question
dig powweb.com. NS
Answer
powweb.com. 5 NS ns2.powweb.com.
powweb.com. 5 NS ns3.powweb.com.
Authority
The response has no authority records.
Additional
ns2.powweb.com. 5 A 65.254.254.134
ns3.powweb.com. 5 A 65.254.254.135
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0