Apex domains cannot have CNAME records.
Question and response
Question
dig krpservers.com. NS
Answer
krpservers.com. 5 NS ns2.krpservers.com.
krpservers.com. 5 NS ns0.krpservers.com.
krpservers.com. 5 NS ns1.krpservers.com.
Authority
The response has no authority records.
Additional
ns0.krpservers.com. 5 A 62.13.128.200
ns1.krpservers.com. 5 A 62.13.128.202
ns2.krpservers.com. 5 A 72.52.72.35
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0