ns2.memset.com has no CNAME records.
Question and response
Question
dig ns2.memset.com. NS
Answer
The response has no answer records.
Authority
memset.com. 2232 SOA ns1.memset.com. hostmaster.memset.com. 1771748116 16384 2048 1048576 2560
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0