mx.505worlds2006.com has no NS records.
NS records for this zone are defined at 505worlds2006.com.
NS records for this zone are defined at 505worlds2006.com.
Question and response
Question
dig mx.505worlds2006.com. NS
Answer
The response has no answer records.
Authority
505worlds2006.com. 3600 SOA dns.505worlds2006.com. hostmaster.505worlds2006.com. 1830677460 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0