mail.ybaca.net has no NS records.
NS records for this zone are defined at ybaca.net.
NS records for this zone are defined at ybaca.net.
Question and response
Question
dig mail.ybaca.net. NS
Answer
The response has no answer records.
Authority
ybaca.net. 86400 SOA ns-2.awsdns-00.com. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0