ns1.robiblog.com has no NS records.
NS records for this zone are defined at robiblog.com.
NS records for this zone are defined at robiblog.com.
Question and response
Question
dig ns1.robiblog.com. NS
Answer
The response has no answer records.
Authority
robiblog.com. 600 SOA ns1.robiblog.com. hostmaster.robiblog.com. 2603132246 300 300 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0