Apex domains cannot have CNAME records.
Question and response
Question
dig memset.com. NS
Answer
memset.com. 5 NS ns2.memset.com.
memset.com. 5 NS ns3.memset.com.
memset.com. 5 NS ns1.memset.com.
Authority
The response has no authority records.
Additional
ns1.memset.com. 5 A 89.200.136.74
ns2.memset.com. 5 A 78.31.107.87
ns3.memset.com. 5 A 31.222.188.99
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0