mail.memset.com has no NS records.
NS records for this zone are defined at memset.com.
NS records for this zone are defined at memset.com.
Question and response
Question
dig mail.memset.com. NS
Answer
The response has no answer records.
Authority
memset.com. 2337 SOA ns1.memset.com. hostmaster.memset.com. 1771783215 16384 2048 1048576 2560
Additional
. 0 OPT ; payload 1680, xrcode 0, version 0, flags 0