spamv.megared.com.mx has no NS records.
NS records for this zone are defined at megared.com.mx.
NS records for this zone are defined at megared.com.mx.
Question and response
Question
dig spamv.megared.com.mx. NS
Answer
The response has no answer records.
Authority
megared.com.mx. 600 SOA unix1.megared.net.mx. root.unix1.megared.net.mx. 113 3600 900 604800 600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0