mail.vtoasp.com has no NS records.
NS records for this zone are defined at vtoasp.com.
NS records for this zone are defined at vtoasp.com.
Question and response
Question
dig mail.vtoasp.com. NS
Answer
The response has no answer records.
Authority
vtoasp.com. 3600 SOA ns1.namesystem.se. hostmaster.odc.fi. 15 10800 2700 1814400 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0