sweep.mercanvinc.com has no NS records.
NS records for this zone are defined at mercanvinc.com.
NS records for this zone are defined at mercanvinc.com.
Question and response
Question
dig sweep.mercanvinc.com. NS
Answer
The response has no answer records.
Authority
mercanvinc.com. 3601 SOA dns1.registrar-servers.com. hostmaster.registrar-servers.com. 1770023110 43200 3600 604800 3601
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0