Apex domains cannot have CNAME records.
Question and response
Question
dig swatco.com. NS
Answer
swatco.com. 5 NS ns2.swatco.com.
swatco.com. 5 NS ns1.swatco.com.
Authority
The response has no authority records.
Additional
ns1.swatco.com. 5 A 174.137.0.1
ns2.swatco.com. 5 A 174.137.15.1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0