dns.ivanentel.com has no NS records.
NS records for this zone are defined at ivanentel.com.
NS records for this zone are defined at ivanentel.com.
Question and response
Question
dig dns.ivanentel.com. NS
Answer
The response has no answer records.
Authority
ivanentel.com. 3600 SOA dns.ivanentel.com. hostmaster.ivanentel.com. 1237974187 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0