dns.mortillo.com has no NS records.
NS records for this zone are defined at mortillo.com.
NS records for this zone are defined at mortillo.com.
Question and response
Question
dig dns.mortillo.com. NS
Answer
The response has no answer records.
Authority
mortillo.com. 3600 SOA dns.mortillo.com. hostmaster.mortillo.com. 1222242044 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0