dns.estumercado.com has no NS records.
NS records for this zone are defined at estumercado.com.
NS records for this zone are defined at estumercado.com.
Question and response
Question
dig dns.estumercado.com. NS
Answer
The response has no answer records.
Authority
estumercado.com. 3600 SOA dns.estumercado.com. hostmaster.estumercado.com. 1320518550 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0