portatutelefono.com.mx has no NS records.
NS records for this zone are defined at com.mx.
NS records for this zone are defined at com.mx.
Question and response
Question
dig portatutelefono.com.mx. NS
Answer
The response has no answer records.
Authority
com.mx. 1800 SOA m.mx-ns.mx. hostmaster.nic.mx. 1773934271 900 900 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0