mx.1650-1850.net has no NS records.
NS records for this zone are defined at 1650-1850.net.
NS records for this zone are defined at 1650-1850.net.
Question and response
Question
dig mx.1650-1850.net. NS
Answer
The response has no answer records.
Authority
1650-1850.net. 3600 SOA ns1.ipage.com. dnsadmin.ipage.com. 2018051269 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0