Apex domains cannot have CNAME records.
Question and response
Question
dig ithoughtthat.com. NS
Answer
ithoughtthat.com. 1 NS ns2.ithoughtthat.com.
ithoughtthat.com. 1 NS ns1.ithoughtthat.com.
Authority
The response has no authority records.
Additional
ns1.ithoughtthat.com. 1 A 50.2.108.6
ns2.ithoughtthat.com. 1 A 50.2.115.170
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0