speedtest4.inext.net.mx has no NS records.
NS records for this zone are defined at inext.net.mx.
NS records for this zone are defined at inext.net.mx.
Question and response
Question
dig speedtest4.inext.net.mx. NS
Answer
The response has no answer records.
Authority
inext.net.mx. 86400 SOA idcdns1.inext.net.mx. hostmaster.inext.net.mx. 2012080100 10800 3600 1209600 86400
Additional
. 0 OPT ; payload 2800, xrcode 0, version 0, flags 0