Apex domains cannot have CNAME records.
Question and response
Question
dig ns82.adriahost.com. NS
Answer
ns82.adriahost.com. 5 NS ns82.adriahost.com.
ns82.adriahost.com. 5 NS ns81.adriahost.com.
Authority
The response has no authority records.
Additional
ns81.adriahost.com. 5 A 95.211.216.242
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0