ns1.mainnameserver.com has no NS records.
NS records for this zone are defined at mainnameserver.com.
NS records for this zone are defined at mainnameserver.com.
Question and response
Question
dig ns1.mainnameserver.com. NS
Answer
The response has no answer records.
Authority
mainnameserver.com. 10800 SOA ns1.gandi.net. hostmaster.gandi.net. 1772064000 10800 3600 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0