Apex domains cannot have CNAME records.
Question and response
Question
dig directi.com. NS
Answer
directi.com. 5 NS eur2.akam.net.
directi.com. 5 NS asia1.akam.net.
directi.com. 5 NS usc5.akam.net.
directi.com. 5 NS usc4.akam.net.
directi.com. 5 NS eur6.akam.net.
directi.com. 5 NS eur4.akam.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0